SMTP command injection via CRLF sequences in RCPT TO or MAIL FROM commands in Net::SMTP

A SMTP command injection flaw was found in the way Ruby's Net::SMTP module handled CRLF sequences in certain SMTP commands. An attacker could potentially use this flaw to inject SMTP commands in a SMTP session in order to facilitate phishing attacks or spam campaigns.
(CVE-2015-9096)

Escape sequence injection vulnerability in the Basic authentication of WEBrick

The Basic authentication code in WEBrick library in Ruby allows remote attackers to inject terminal emulator escape sequences into its log and possibly execute arbitrary commands via a crafted user name.
(CVE-2017-10784)

Buffer underrun in OpenSSL ASN1 decode

The decode method in the OpenSSL::ASN1 module in Ruby allows attackers to cause a denial of service (interpreter crash) via a crafted string.
(CVE-2017-14033)

No size limit in summary length of gem spec

RubyGems is vulnerable to maliciously crafted gem specifications to cause a denial of service attack against RubyGems clients who have issued a `query` command. (CVE-2017-0900)

Arbitrary file overwrite due to incorrect validation of specification name

RubyGems fails to validate specification names, allowing a maliciously crafted gem to potentially overwrite any file on the filesystem.
(CVE-2017-0901)

DNS hijacking vulnerability

RubyGems is vulnerable to a DNS hijacking vulnerability that allows a MITM attacker to force the RubyGems client to download and install gems from a server that the attacker controls. (CVE-2017-0902)

Buffer underrun vulnerability in Kernel.sprintf

Ruby is vulnerable to a malicious format string which contains a precious specifier (*) with a huge minus value. Such situation can lead to a buffer overrun, resulting in a heap memory corruption or an information disclosure from the heap. (CVE-2017-0898)

Escape sequence in the 'summary' field of gemspec

RubyGems is vulnerable to maliciously crafted gem specifications that include terminal escape characters. Printing the gem specification would execute terminal escape sequences. (CVE-2017-0899)

Arbitrary heap exposure during a JSON.generate call

Ruby can expose arbitrary memory during a JSON.generate call. The issues lies in using strdup in ext/json/ext/generator/generator.c, which will stop after encountering a '\\0' byte, returning a pointer to a string of length zero, which is not the length stored in space_len. (CVE-2017-14064)

A vulnerability was found where the rubygems module was vulnerable to an unsafe YAML deserialization when inspecting a gem. Applications inspecting gem files without installing them can be tricked to execute arbitrary code in the context of the ruby interpreter. (CVE-2017-0903)

The remote host is affected by the vulnerability described in GLSA-201710-01 (RubyGems: Multiple vulnerabilities)

    Multiple vulnerabilities have been discovered in RubyGems. Please review       the referenced CVE identifiers for details.
  Impact :

    A remote attacker, by enticing a user to install a specially crafted       gem, could possibly execute arbitrary code with the privileges of the       process or cause a Denial of Service condition.
  Workaround :

    There is no known workaround at this time.

Arbitrary heap exposure during a JSON.generate call

Ruby through 2.2.7, 2.3.x through 2.3.4, and 2.4.x through 2.4.1 can expose arbitrary memory during a JSON.generate call. The issues lies in using strdup in ext/json/ext/generator/generator.c, which will stop after encountering a '\\0' byte, returning a pointer to a string of length zero, which is not the length stored in space_len.
(CVE-2017-14064)

Escape sequence injection vulnerability in the Basic authentication of WEBrick

The Basic authentication code in WEBrick library in Ruby before 2.2.8, 2.3.x before 2.3.5, and 2.4.x through 2.4.1 allows remote attackers to inject terminal emulator escape sequences into its log and possibly execute arbitrary commands via a crafted user name. (CVE-2017-10784)

Buffer underrun in OpenSSL ASN1 decode

The decode method in the OpenSSL::ASN1 module in Ruby before 2.2.8, 2.3.x before 2.3.5, and 2.4.x through 2.4.1 allows attackers to cause a denial of service (interpreter crash) via a crafted string.
(CVE-2017-14033)

No size limit in summary length of gem spec

RubyGems version 2.6.12 and earlier is vulnerable to maliciously crafted gem specifications to cause a denial of service attack against RubyGems clients who have issued a `query` command. (CVE-2017-0900)

Arbitrary file overwrite due to incorrect validation of specification name

RubyGems version 2.6.12 and earlier fails to validate specification names, allowing a maliciously crafted gem to potentially overwrite any file on the filesystem. (CVE-2017-0901)

DNS hijacking vulnerability

RubyGems version 2.6.12 and earlier is vulnerable to a DNS hijacking vulnerability that allows a MITM attacker to force the RubyGems client to download and install gems from a server that the attacker controls.
(CVE-2017-0902)

Buffer underrun vulnerability in Kernel.sprintf

Ruby before 2.4.2, 2.3.5, and 2.2.8 is vulnerable to a malicious format string which contains a precious specifier (*) with a huge minus value. Such situation can lead to a buffer overrun, resulting in a heap memory corruption or an information disclosure from the heap.
(CVE-2017-0898)

Escape sequence in the 'summary' field of gemspec

RubyGems version 2.6.12 and earlier is vulnerable to maliciously crafted gem specifications that include terminal escape characters.
Printing the gem specification would execute terminal escape sequences. (CVE-2017-0899)

A vulnerability was found where the rubygems module was vulnerable to an unsafe YAML deserialization when inspecting a gem. Applications inspecting gem files without installing them can be tricked to execute arbitrary code in the context of the ruby interpreter. (CVE-2017-0903)

An update for ruby is now available for Red Hat Enterprise Linux 7.

Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

Ruby is an extensible, interpreted, object-oriented, scripting language. It has features to process text files and to perform system management tasks.

Security Fix(es) :

* It was discovered that the Net::FTP module did not properly process filenames in combination with certain operations. A remote attacker could exploit this flaw to execute arbitrary commands by setting up a malicious FTP server and tricking a user or Ruby application into downloading files with specially crafted names using the Net::FTP module. (CVE-2017-17405)

* A buffer underflow was found in ruby's sprintf function. An attacker, with ability to control its format string parameter, could send a specially crafted string that would disclose heap memory or crash the interpreter. (CVE-2017-0898)

* It was found that rubygems did not sanitize gem names during installation of a given gem. A specially crafted gem could use this flaw to install files outside of the regular directory.
(CVE-2017-0901)

* A vulnerability was found where rubygems did not sanitize DNS responses when requesting the hostname of the rubygems server for a domain, via a _rubygems._tcp DNS SRV query. An attacker with the ability to manipulate DNS responses could direct the gem command towards a different domain. (CVE-2017-0902)

* A vulnerability was found where the rubygems module was vulnerable to an unsafe YAML deserialization when inspecting a gem. Applications inspecting gem files without installing them can be tricked to execute arbitrary code in the context of the ruby interpreter. (CVE-2017-0903)

* It was found that WEBrick did not sanitize all its log messages. If logs were printed in a terminal, an attacker could interact with the terminal via the use of escape sequences. (CVE-2017-10784)

* It was found that the decode method of the OpenSSL::ASN1 module was vulnerable to buffer underrun. An attacker could pass a specially crafted string to the application in order to crash the ruby interpreter, causing a denial of service. (CVE-2017-14033)

* A vulnerability was found where rubygems did not properly sanitize gems' specification text. A specially crafted gem could interact with the terminal via the use of escape sequences. (CVE-2017-0899)

* It was found that rubygems could use an excessive amount of CPU while parsing a sufficiently long gem summary. A specially crafted gem from a gem repository could freeze gem commands attempting to parse its summary. (CVE-2017-0900)

* A buffer overflow vulnerability was found in the JSON extension of ruby. An attacker with the ability to pass a specially crafted JSON input to the extension could use this flaw to expose the interpreter's heap memory. (CVE-2017-14064)

* The 'lazy_initialize' function in lib/resolv.rb did not properly process certain filenames. A remote attacker could possibly exploit this flaw to inject and execute arbitrary commands. (CVE-2017-17790)

The remote Ubuntu 14.04 LTS / 16.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-3685-1 advisory.

    Some of these CVE were already addressed in previous USN: 3439-1, 3553-1, 3528-1. Here we address for the     remain releases.

    It was discovered that Ruby incorrectly handled certain inputs. An attacker could use this to cause a     buffer overrun. (CVE-2017-0898)

    It was discovered that Ruby incorrectly handled certain files. An attacker could use this to overwrite any     file on the filesystem. (CVE-2017-0901)

    It was discovered that Ruby was vulnerable to a DNS hijacking vulnerability. An attacker could use this to     possibly force the RubyGems client to download and install gems from a server that the attacker controls.
    (CVE-2017-0902)

    It was discovered that Ruby incorrectly handled certain YAML files. An attacker could use this to possibly     execute arbitrary code. (CVE-2017-0903)

    It was discovered that Ruby incorrectly handled certain files. An attacker could use this to expose     sensitive information. (CVE-2017-14064)

    It was discovered that Ruby incorrectly handled certain inputs. An attacker could use this to execute     arbitrary code. (CVE-2017-10784)

    It was discovered that Ruby incorrectly handled certain network requests. An attacker could possibly use     this to inject a crafted key into a HTTP response. (CVE-2017-17742)

    It was discovered that Ruby incorrectly handled certain files. An attacker could possibly use this to     execute arbitrary code. This update is only addressed to ruby2.0. (CVE-2018-1000074)

    It was discovered that Ruby incorrectly handled certain network requests. An attacker could possibly use     this to cause a denial of service. (CVE-2018-8777)

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
103603	Amazon Linux AMI : ruby22 / ruby23 (ALAS-2017-906)	Nessus	Amazon Linux Local Security Checks	2017/10/3	2025/11/19	critical
103719	GLSA-201710-01 : RubyGems: Multiple vulnerabilities	Nessus	Gentoo Local Security Checks	2017/10/9	2025/11/19	critical
104181	Amazon Linux AMI : ruby24 (ALAS-2017-915)	Nessus	Amazon Linux Local Security Checks	2017/10/27	2025/11/17	critical
107270	CentOS 7 : ruby (CESA-2018:0378)	Nessus	CentOS Local Security Checks	2018/3/12	2025/10/24	critical
110551	Ubuntu 14.04 LTS / 16.04 LTS : Ruby vulnerabilities (USN-3685-1)	Nessus	Ubuntu Local Security Checks	2018/6/15	2024/8/27	critical

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