New mozilla-thunderbird packages are available for Slackware 14.2 and
-current to fix security issues.

Multiple security issues have been found in the Mozilla Firefox web browser, which could potentially result in the execution of arbitrary code.

The version of Firefox installed on the remote macOS or Mac OS X host is prior to 73.0. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2020-05 advisory.

  - Mozilla developers Jason Kratzer, Tyson Smith, and Christian Holler reported memory safety bugs present in     Firefox 72. Some of these bugs showed evidence of memory corruption and we presume that with enough effort     some of these could have been exploited to run arbitrary code. (CVE-2020-6801)

  - A content process could have modified shared memory relating to crash reporting information, crash itself,     and cause an out-of-bound write. This could have caused memory corruption and a potentially exploitable     crash. (CVE-2020-6796)

  - By downloading a file with the .fileloc extension, a semi-privileged extension could launch an arbitrary     application on the user's computer. The attacker is restricted as they are unable to download non-     quarantined files or supply command line arguments to the application, limiting the impact. Note: this     issue only occurs on Mac OSX. Other operating systems are unaffected. (CVE-2020-6797)

  - If a <code><template></code> tag was used in a <code><select%gt;</code> tag, the parser could be     confused and allow JavaScript parsing and execution when it should not be allowed. A site that relied on     the browser behaving correctly could suffer a cross-site scripting vulnerability as a result.
    (CVE-2020-6798)

  - Command line arguments could have been injected during Firefox invocation as a shell handler for certain     unsupported file types. This required Firefox to be configured as the default handler for a given file     type and for a file downloaded to be opened in a third party application that insufficiently sanitized URL     data. In that situation, clicking a link in the third party application could have been used to retrieve     and execute files whose location was supplied through command line arguments.  Note: This issue only     affects Windows operating systems and when Firefox is configured as the default handler for non-default     filetypes. Other operating systems are unaffected. (CVE-2020-6799)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Security Fix(es) :

  - Mozilla: Missing bounds check on shared memory read in     the parent process (CVE-2020-6796)

  - Mozilla: Memory safety bugs fixed in Firefox 73 and     Firefox ESR 68.5 (CVE-2020-6800)

  - Mozilla: Incorrect parsing of template tag could result     in JavaScript injection (CVE-2020-6798)

This update for MozillaFirefox fixes the following issues :

Firefox Extended Support Release 68.5.0 ESR

  - CVE-2020-6796 (bmo#1610426) Missing bounds check on     shared memory read in the parent process

  - CVE-2020-6797 (bmo#1596668) Extensions granted     downloads.open permission could open arbitrary     applications on Mac OSX

  - CVE-2020-6798 (bmo#1602944) Incorrect parsing of     template tag could result in JavaScript injection

  - CVE-2020-6799 (bmo#1606596) Arbitrary code execution     when opening pdf links from other applications, when     Firefox is configured as default pdf reader

  - CVE-2020-6800 (bmo#1595786, bmo#1596706, bmo#1598543,     bmo#1604851, bmo#1605777, bmo#1608580, bmo#1608785)     Memory safety bugs fixed in Firefox 73 and Firefox ESR     68.5

  - Fixed: Fixed various issues opening files with spaces in     their path (bmo#1601905, bmo#1602726)

Note that Tenable Network Security has extracted the preceding description block directly from the SUSE security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

The version of Firefox ESR installed on the remote macOS or Mac OS X host is prior to 68.5. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2020-06 advisory.

  - Mozilla developers and community members Raul Gurzau, Tyson Smith, Bob Clary, Liz Henry, and Christian     Holler reported memory safety bugs present in Firefox 72 and Firefox ESR 68.4. Some of these bugs showed     evidence of memory corruption and we presume that with enough effort some of these could have been     exploited to run arbitrary code. (CVE-2020-6800)

  - A content process could have modified shared memory relating to crash reporting information, crash itself,     and cause an out-of-bound write. This could have caused memory corruption and a potentially exploitable     crash. (CVE-2020-6796)

  - By downloading a file with the .fileloc extension, a semi-privileged extension could launch an arbitrary     application on the user's computer. The attacker is restricted as they are unable to download non-     quarantined files or supply command line arguments to the application, limiting the impact. Note: this     issue only occurs on Mac OSX. Other operating systems are unaffected. (CVE-2020-6797)

  - If a <code><template></code> tag was used in a <code><select%gt;</code> tag, the parser could be     confused and allow JavaScript parsing and execution when it should not be allowed. A site that relied on     the browser behaving correctly could suffer a cross-site scripting vulnerability as a result.
    (CVE-2020-6798)

  - Command line arguments could have been injected during Firefox invocation as a shell handler for certain     unsupported file types. This required Firefox to be configured as the default handler for a given file     type and for a file downloaded to be opened in a third party application that insufficiently sanitized URL     data. In that situation, clicking a link in the third party application could have been used to retrieve     and execute files whose location was supplied through command line arguments.  Note: This issue only     affects Windows operating systems and when Firefox is configured as the default handler for non-default     filetypes. Other operating systems are unaffected. (CVE-2020-6799)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote NewStart CGSL host, running version CORE 5.04 / MAIN 5.04, has thunderbird packages installed that are affected by multiple vulnerabilities:

  - When processing an email message with an ill-formed     envelope, Thunderbird could read data from a random     memory location. This vulnerability affects Thunderbird     < 68.5. (CVE-2020-6793)

  - When processing a message that contains multiple S/MIME     signatures, a bug in the MIME processing code caused a     null pointer dereference, leading to an unexploitable     crash. This vulnerability affects Thunderbird < 68.5.
    (CVE-2020-6795)

  - When deriving an identifier for an email message,     uninitialized memory was used in addition to the message     contents. This vulnerability affects Thunderbird < 68.5.
    (CVE-2020-6792)

  - If a template tag was used in a select tag, the parser     could be confused and allow JavaScript parsing and     execution when it should not be allowed. A site that     relied on the browser behaving correctly could suffer a     cross-site scripting vulnerability as a result. In     general, this flaw cannot be exploited through email in     the Thunderbird product because scripting is disabled     when reading mail, but is potentially a risk in browser     or browser-like contexts. This vulnerability affects     Thunderbird < 68.5, Firefox < 73, and Firefox < ESR68.5.
    (CVE-2020-6798)

  - Mozilla developers and community members reported memory     safety bugs present in Firefox 72 and Firefox ESR 68.4.
    Some of these bugs showed evidence of memory corruption     and we presume that with enough effort some of these     could have been exploited to run arbitrary code. In     general, these flaws cannot be exploited through email     in the Thunderbird product because scripting is disabled     when reading mail, but are potentially risks in browser     or browser-like contexts. This vulnerability affects     Thunderbird < 68.5, Firefox < 73, and Firefox < ESR68.5.
    (CVE-2020-6800)

  - If a user saved passwords before Thunderbird 60 and then     later set a master password, an unencrypted copy of     these passwords is still accessible. This is because the     older stored password file was not deleted when the data     was copied to a new format starting in Thunderbird 60.
    The new master password is added only on the new file.
    This could allow the exposure of stored password data     outside of user expectations. This vulnerability affects     Thunderbird < 68.5. (CVE-2020-6794)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote Oracle Linux 8 host has a package installed that is affected by multiple vulnerabilities as referenced in the ELSA-2020-0577 advisory.

    [68.5.0-1.0.1.el8_1]
    - Replaced thunderbird-redhat-default-prefs.js with thunderbird-oracle-default-prefs.js

    [68.5.0-1]
    - Update to 68.5.0 build1

Tenable has extracted the preceding description block directly from the Oracle Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Ubuntu 16.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-4278-2 advisory.

    USN-4278-1 fixed vulnerabilities in Firefox. This update provides the corresponding update for Ubuntu     16.04 LTS.



Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - If a template tag was used in a select tag, the parser could be confused and allow JavaScript parsing and     execution when it should not be allowed. A site that relied on the browser behaving correctly could suffer     a cross-site scripting vulnerability as a result. In general, this flaw cannot be exploited through email     in the Thunderbird product because scripting is disabled when reading mail, but is potentially a risk in     browser or browser-like contexts. This vulnerability affects Thunderbird < 68.5, Firefox < 73, and Firefox     < ESR68.5. (CVE-2020-6798)

Note that Nessus relies on the presence of the package as reported by the vendor.

The remote NewStart CGSL host, running version CORE 5.05 / MAIN 5.05, has thunderbird packages installed that are affected by multiple vulnerabilities:

  - When removing data about an origin whose tab was recently closed, a use-after-free could occur in the     Quota manager, resulting in a potentially exploitable crash. This vulnerability affects Thunderbird <     68.6, Firefox < 74, Firefox < ESR68.6, and Firefox ESR < 68.6. (CVE-2020-6805)

  - By carefully crafting promise resolutions, it was possible to cause an out-of-bounds read off the end of     an array resized during script execution. This could have led to memory corruption and a potentially     exploitable crash. This vulnerability affects Thunderbird < 68.6, Firefox < 74, Firefox < ESR68.6, and     Firefox ESR < 68.6. (CVE-2020-6806)

  - When pasting a <style> tag from the clipboard into a rich text editor, the CSS sanitizer does not     escape < and > characters. Because the resulting string is pasted directly into the text node of the     element this does not result in a direct injection into the webpage; however, if a webpage subsequently     copies the node's innerHTML, assigning it to another innerHTML, this would result in an XSS vulnerability.
    Two WYSIWYG editors were identified with this behavior, more may exist. This vulnerability affects Firefox     ESR < 68.4 and Firefox < 72. (CVE-2019-17022)

  - When pasting a <style> tag from the clipboard into a rich text editor, the CSS sanitizer incorrectly     rewrites a @namespace rule. This could allow for injection into certain types of websites resulting in     data exfiltration. This vulnerability affects Firefox ESR < 68.4 and Firefox < 72. (CVE-2019-17016)

  - Due to a missing case handling object types, a type confusion vulnerability could occur, resulting in a     crash. We presume that with enough effort that it could be exploited to run arbitrary code. This     vulnerability affects Firefox ESR < 68.4 and Firefox < 72. (CVE-2019-17017)

  - Mozilla developers reported memory safety bugs present in Firefox 71 and Firefox ESR 68.3. Some of these     bugs showed evidence of memory corruption and we presume that with enough effort some of these could have     been exploited to run arbitrary code. This vulnerability affects Firefox ESR < 68.4 and Firefox < 72.
    (CVE-2019-17024)

  - Incorrect alias information in IonMonkey JIT compiler for setting array elements could lead to a type     confusion. We are aware of targeted attacks in the wild abusing this flaw. This vulnerability affects     Firefox ESR < 68.4.1, Thunderbird < 68.4.1, and Firefox < 72.0.1. (CVE-2019-17026)

  - When processing an email message with an ill-formed envelope, Thunderbird could read data from a random     memory location. This vulnerability affects Thunderbird < 68.5. (CVE-2020-6793)

  - When processing a message that contains multiple S/MIME signatures, a bug in the MIME processing code     caused a null pointer dereference, leading to an unexploitable crash. This vulnerability affects     Thunderbird < 68.5. (CVE-2020-6795)

  - When deriving an identifier for an email message, uninitialized memory was used in addition to the message     contents. This vulnerability affects Thunderbird < 68.5. (CVE-2020-6792)

  - If a template tag was used in a select tag, the parser could be confused and allow JavaScript parsing and     execution when it should not be allowed. A site that relied on the browser behaving correctly could suffer     a cross-site scripting vulnerability as a result. In general, this flaw cannot be exploited through email     in the Thunderbird product because scripting is disabled when reading mail, but is potentially a risk in     browser or browser-like contexts. This vulnerability affects Thunderbird < 68.5, Firefox < 73, and Firefox     < ESR68.5. (CVE-2020-6798)

  - Mozilla developers and community members reported memory safety bugs present in Firefox 72 and Firefox ESR     68.4. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some     of these could have been exploited to run arbitrary code. In general, these flaws cannot be exploited     through email in the Thunderbird product because scripting is disabled when reading mail, but are     potentially risks in browser or browser-like contexts. This vulnerability affects Thunderbird < 68.5,     Firefox < 73, and Firefox < ESR68.5. (CVE-2020-6800)

  - If a user saved passwords before Thunderbird 60 and then later set a master password, an unencrypted copy     of these passwords is still accessible. This is because the older stored password file was not deleted     when the data was copied to a new format starting in Thunderbird 60. The new master password is added only     on the new file. This could allow the exposure of stored password data outside of user expectations. This     vulnerability affects Thunderbird < 68.5. (CVE-2020-6794)

  - The 'Copy as cURL' feature of Devtools' network tab did not properly escape the HTTP method of a request,     which can be controlled by the website. If a user used the 'Copy as Curl' feature and pasted the command     into a terminal, it could have resulted in command injection and arbitrary command execution. This     vulnerability affects Thunderbird < 68.6, Firefox < 74, Firefox < ESR68.6, and Firefox ESR < 68.6.
    (CVE-2020-6811)

  - usrsctp before 2019-12-20 has out-of-bounds reads in sctp_load_addresses_from_init. (CVE-2019-20503)

  - The first time AirPods are connected to an iPhone, they become named after the user's name by default     (e.g. Jane Doe's AirPods.) Websites with camera or microphone permission are able to enumerate device     names, disclosing the user's name. To resolve this issue, Firefox added a special case that renames     devices containing the substring 'AirPods' to simply 'AirPods'. This vulnerability affects Thunderbird <     68.6, Firefox < 74, Firefox < ESR68.6, and Firefox ESR < 68.6. (CVE-2020-6812)

  - When a device was changed while a stream was about to be destroyed, the stream-reinit task     may have been executed after the stream was destroyed, causing a use-after-free and a potentially     exploitable crash. This vulnerability affects Thunderbird < 68.6, Firefox < 74, Firefox < ESR68.6, and     Firefox ESR < 68.6. (CVE-2020-6807)

  - Mozilla developers reported memory safety bugs present in Firefox and Thunderbird 68.5. Some of these bugs     showed evidence of memory corruption and we presume that with enough effort some of these could have been     exploited to run arbitrary code. This vulnerability affects Thunderbird < 68.6, Firefox < 74, Firefox <     ESR68.6, and Firefox ESR < 68.6. (CVE-2020-6814)

  - Under certain conditions, when running the nsDocShell destructor, a race condition can cause a use-after-     free. We are aware of targeted attacks in the wild abusing this flaw. This vulnerability affects     Thunderbird < 68.7.0, Firefox < 74.0.1, and Firefox ESR < 68.6.1. (CVE-2020-6819)

  - Under certain conditions, when handling a ReadableStream, a race condition can cause a use-after-free. We     are aware of targeted attacks in the wild abusing this flaw. This vulnerability affects Thunderbird <     68.7.0, Firefox < 74.0.1, and Firefox ESR < 68.6.1. (CVE-2020-6820)

  - When reading from areas partially or fully outside the source resource with WebGL's     copyTexSubImage method, the specification requires the returned values be zero. Previously,     this memory was uninitialized, leading to potentially sensitive data disclosure. This vulnerability     affects Thunderbird < 68.7.0, Firefox ESR < 68.7, and Firefox < 75. (CVE-2020-6821)

  - On 32-bit builds, an out of bounds write could have occurred when processing an image larger than 4 GB in     GMPDecodeData. It is possible that with enough effort this could have been exploited to run     arbitrary code. This vulnerability affects Thunderbird < 68.7.0, Firefox ESR < 68.7, and Firefox < 75.
    (CVE-2020-6822)

  - Mozilla developers and community members Tyson Smith and Christian Holler reported memory safety bugs     present in Firefox 74 and Firefox ESR 68.6. Some of these bugs showed evidence of memory corruption and we     presume that with enough effort some of these could have been exploited to run arbitrary code. This     vulnerability affects Thunderbird < 68.7.0, Firefox ESR < 68.7, and Firefox < 75. (CVE-2020-6825)

  - A race condition when running shutdown code for Web Worker led to a use-after-free vulnerability. This     resulted in a potentially exploitable crash. This vulnerability affects Firefox ESR < 68.8, Firefox < 76,     and Thunderbird < 68.8.0. (CVE-2020-12387)

  - A buffer overflow could occur when parsing and validating SCTP chunks in WebRTC. This could have led to     memory corruption and a potentially exploitable crash. This vulnerability affects Firefox ESR < 68.8,     Firefox < 76, and Thunderbird < 68.8.0. (CVE-2020-6831)

  - The 'Copy as cURL' feature of Devtools' network tab did not properly escape the HTTP POST data of a     request, which can be controlled by the website. If a user used the 'Copy as cURL' feature and pasted the     command into a terminal, it could have resulted in the disclosure of local files. This vulnerability     affects Firefox ESR < 68.8, Firefox < 76, and Thunderbird < 68.8.0. (CVE-2020-12392)

  - Mozilla developers and community members reported memory safety bugs present in Firefox 75 and Firefox ESR     68.7. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some     of these could have been exploited to run arbitrary code. This vulnerability affects Firefox ESR < 68.8,     Firefox < 76, and Thunderbird < 68.8.0. (CVE-2020-12395)

  - By encoding Unicode whitespace characters within the From email header, an attacker can spoof the sender     email address that Thunderbird displays. This vulnerability affects Thunderbird < 68.8.0. (CVE-2020-12397)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote Ubuntu 16.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-4335-1 advisory.

    Multiple security issues were discovered in Thunderbird. If a user were tricked in to opening a specially     crafted website in a browsing context, an attacker could potentially exploit these to cause a denial of     service, obtain sensitive information, bypass security restrictions, bypass same-origin restrictions,     conduct cross-site scripting (XSS) attacks, or execute arbitrary code. (CVE-2019-11757, CVE-2019-11758,     CVE-2019-11759, CVE-2019-11760, CVE-2019-11761, CVE-2019-11762, CVE-2019-11763, CVE-2019-11764,     CVE-2019-17005, CVE-2019-17008, CVE-2019-17010, CVE-2019-17011, CVE-2019-17012, CVE-2019-17016,     CVE-2019-17017, CVE-2019-17022, CVE-2019-17024, CVE-2019-17026, CVE-2019-20503, CVE-2020-6798,     CVE-2020-6800, CVE-2020-6805, CVE-2020-6806, CVE-2020-6807, CVE-2020-6812, CVE-2020-6814, CVE-2020-6819,     CVE-2020-6820, CVE-2020-6821, CVE-2020-6825)

    It was discovered that NSS incorrectly handled certain memory operations. A remote attacker could     potentially exploit this to cause a denial of service, or execute arbitrary code. (CVE-2019-11745)

    It was discovered that a specially crafted S/MIME message with an inner encryption layer could be     displayed as having a valid signature in some circumstances, even if the signer had no access to the     encrypted message. An attacker could potentially exploit this to spoof the message author.
    (CVE-2019-11755)

    A heap overflow was discovered in the expat library in Thunderbird. If a user were tricked in to opening a     specially crafted message, an attacker could potentially exploit this to cause a denial of service, or     execute arbitrary code. (CVE-2019-15903)

    It was discovered that Message ID calculation was based on uninitialized data. An attacker could     potentially exploit this to obtain sensitive information. (CVE-2020-6792)

    Mutiple security issues were discovered in Thunderbird. If a user were tricked in to opening a specially     crafted message, an attacker could potentially exploit these to cause a denial of service, obtain     sensitive information, or execute arbitrary code. (CVE-2020-6793, CVE-2020-6795, CVE-2020-6822)

    It was discovered that if a user saved passwords before Thunderbird 60 and then later set a primary     password, an unencrypted copy of these passwords would still be accessible. A local user could exploit     this to obtain sensitive information. (CVE-2020-6794)

    It was discovered that the Devtools Copy as cURL feature did not fully escape website-controlled     data. If a user were tricked in to using the Copy as cURL feature to copy and paste a command with     specially crafted data in to a terminal, an attacker could potentially exploit this to execute arbitrary     commands via command injection. (CVE-2020-6811)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

ID	名称	产品	系列	发布时间	最近更新时间	严重程度
133643	Slackware 14.2 / current : mozilla-thunderbird (SSA:2020-042-02)	Nessus	Slackware Local Security Checks	2020/2/12	2024/3/27	high
133657	Debian DSA-4620-1 : firefox-esr - security update	Nessus	Debian Local Security Checks	2020/2/13	2024/3/27	high
133692	Mozilla Firefox < 73.0	Nessus	MacOS X Local Security Checks	2020/2/14	2025/11/18	high
133755	Scientific Linux Security Update : firefox on SL7.x x86_64 (20200217)	Nessus	Scientific Linux Local Security Checks	2020/2/18	2021/1/15	high
133762	SUSE SLED12 / SLES12 Security Update : MozillaFirefox (SUSE-SU-2020:0384-1)	Nessus	SuSE Local Security Checks	2020/2/18	2024/3/27	high
133849	Mozilla Firefox ESR < 68.5	Nessus	MacOS X Local Security Checks	2020/2/21	2025/11/18	high
136909	NewStart CGSL CORE 5.04 / MAIN 5.04 : thunderbird Multiple Vulnerabilities (NS-SA-2020-0025)	Nessus	NewStart CGSL Local Security Checks	2020/5/27	2024/3/8	high
180729	Oracle Linux 8 : thunderbird (ELSA-2020-0577)	Nessus	Oracle Linux Local Security Checks	2023/9/7	2024/10/23	high
183716	Ubuntu 16.04 LTS : Firefox vulnerabilities (USN-4278-2)	Nessus	Ubuntu Local Security Checks	2023/10/23	2024/10/29	high
247001	Linux Distros Unpatched Vulnerability : CVE-2020-6798	Nessus	Misc.	2025/8/9	2025/8/9	medium
143979	NewStart CGSL CORE 5.05 / MAIN 5.05 : thunderbird Multiple Vulnerabilities (NS-SA-2020-0093)	Nessus	NewStart CGSL Local Security Checks	2020/12/9	2023/4/25	critical
135896	Ubuntu 16.04 LTS : Thunderbird vulnerabilities (USN-4335-1)	Nessus	Ubuntu Local Security Checks	2020/4/22	2024/8/29	critical

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