The remote Oracle Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2016-0532 advisory.

    - Fix CVE-2015-8631, CVE-2015-8630, and CVE-2015-8629

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.

An update for krb5 is now available for Red Hat Enterprise Linux 7.

Red Hat Product Security has rated this update as having a security impact of Moderate. 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.

Kerberos is a network authentication system, which can improve the security of your network by eliminating the insecure practice of sending passwords over the network in unencrypted form. It allows clients and servers to authenticate to each other with the help of a trusted third party, the Kerberos key distribution center (KDC).

Security Fix(es) :

* A memory leak flaw was found in the krb5_unparse_name() function of the MIT Kerberos kadmind service. An authenticated attacker could repeatedly send specially crafted requests to the server, which could cause the server to consume large amounts of memory resources, ultimately leading to a denial of service due to memory exhaustion.
(CVE-2015-8631)

* An out-of-bounds read flaw was found in the kadmind service of MIT Kerberos. An authenticated attacker could send a maliciously crafted message to force kadmind to read beyond the end of allocated memory, and write the memory contents to the KDC database if the attacker has write permission, leading to information disclosure. (CVE-2015-8629)

* A NULL pointer dereference flaw was found in the procedure used by the MIT Kerberos kadmind service to store policies: the kadm5_create_principal_3() and kadm5_modify_principal() function did not ensure that a policy was given when KADM5_POLICY was set. An authenticated attacker with permissions to modify the database could use this flaw to add or modify a principal with a policy set to NULL, causing the kadmind service to crash. (CVE-2015-8630)

The CVE-2015-8631 issue was discovered by Simo Sorce of Red Hat.

According to the versions of the krb5 packages installed, the EulerOS installation on the remote host is affected by the following vulnerabilities :

  - A memory leak flaw was found in the krb5_unparse_name()     function of the MIT Kerberos kadmind service. An     authenticated attacker could repeatedly send specially     crafted requests to the server, which could cause the     server to consume large amounts of memory resources,     ultimately leading to a denial of service due to memory     exhaustion.(CVE-2015-8631)

  - An out-of-bounds read flaw was found in the kadmind     service of MIT Kerberos. An authenticated attacker     could send a maliciously crafted message to force     kadmind to read beyond the end of allocated memory, and     write the memory contents to the KDC database if the     attacker has write permission, leading to information     disclosure. (CVE-2015-8629)

  - A NULL pointer dereference flaw was found in the     procedure used by the MIT Kerberos kadmind service to     store policies: the kadm5_create_principal_3() and     kadm5_modify_principal() function did not ensure that a     policy was given when KADM5_POLICY was set. An     authenticated attacker with permissions to modify the     database could use this flaw to add or modify a     principal with a policy set to NULL, causing the     kadmind service to crash. (CVE-2015-8630)

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

The remote NewStart CGSL host, running version MAIN 6.06 (SP), has krb5 packages installed that are affected by multiple vulnerabilities:

  - plugins/preauth/pkinit/pkinit_crypto_openssl.c in MIT Kerberos 5 (aka krb5) through 1.15.2 mishandles     Distinguished Name (DN) fields, which allows remote attackers to execute arbitrary code or cause a denial     of service (buffer overflow and application crash) in situations involving untrusted X.509 data, related     to the get_matching_data and X509_NAME_oneline_ex functions. NOTE: this has security relevance only in use     cases outside of the MIT Kerberos distribution, e.g., the use of get_matching_data in KDC certauth plugin     code that is specific to Red Hat. (CVE-2017-15088)

  - The process_chpw_request function in schpw.c in the password-changing functionality in kadmind in MIT     Kerberos 5 (aka krb5) 1.7 through 1.9 frees an invalid pointer, which allows remote attackers to execute     arbitrary code or cause a denial of service (daemon crash) via a crafted request that triggers an error     condition. (CVE-2011-0285)

  - schpw.c in the kpasswd service in kadmind in MIT Kerberos 5 (aka krb5) before 1.11.3 does not properly     validate UDP packets before sending responses, which allows remote attackers to cause a denial of service     (CPU and bandwidth consumption) via a forged packet that triggers a communication loop, as demonstrated by     krb_pingpong.nasl, a related issue to CVE-1999-0103. (CVE-2002-2443)

  - The (1) ftpd and (2) ksu programs in (a) MIT Kerberos 5 (krb5) up to 1.5, and 1.4.x before 1.4.4, and (b)     Heimdal 0.7.2 and earlier, do not check return codes for setuid calls, which might allow local users to     gain privileges by causing setuid to fail to drop privileges. NOTE: as of 20060808, it is not known     whether an exploitable attack scenario exists for these issues. (CVE-2006-3084)

  - The RPC library in Kerberos 5 1.4 through 1.4.4, and 1.5 through 1.5.1, as used in Kerberos administration     daemon (kadmind) and other products that use this library, calls an uninitialized function pointer in     freed memory, which allows remote attackers to cause a denial of service (crash) and possibly execute     arbitrary code via unspecified vectors. (CVE-2006-6143)

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

Several vulnerabilities were discovered in krb5, the MIT implementation of Kerberos. The Common Vulnerabilities and Exposures project identifies the following problems :

  - CVE-2015-8629     It was discovered that an authenticated attacker can     cause kadmind to read beyond the end of allocated memory     by sending a string without a terminating zero byte.
    Information leakage may be possible for an attacker with     permission to modify the database.

  - CVE-2015-8630     It was discovered that an authenticated attacker with     permission to modify a principal entry can cause kadmind     to dereference a null pointer by supplying a null policy     value but including KADM5_POLICY in the mask.

  - CVE-2015-8631     It was discovered that an authenticated attacker can     cause kadmind to leak memory by supplying a null     principal name in a request which uses one. Repeating     these requests will eventually cause kadmind to exhaust     all available memory.

The remote MiracleLinux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the AXSA:2016-190:01 advisory.

    Kerberos V5 is a trusted-third-party network authentication system,     which can improve your network's security by eliminating the insecure     practice of sending passwords over the network in unencrypted form.
    Security issues fixed with this release:
    CVE-2015-8629     The xdr_nullstring function in lib/kadm5/kadm_rpc_xdr.c in kadmind in     MIT Kerberos 5 (aka krb5) before 1.13.4 and 1.14.x before 1.14.1 does     not verify whether '\0' characters exist as expected, which allows     remote authenticated users to obtain sensitive information or cause a     denial of service (out-of-bounds read) via a crafted string.
    CVE-2015-8630     The (1) kadm5_create_principal_3 and (2) kadm5_modify_principal     functions in lib/kadm5/srv/svr_principal.c in kadmind in MIT Kerberos     5 (aka krb5) 1.12.x and 1.13.x before 1.13.4 and 1.14.x before 1.14.1     allow remote authenticated users to cause a denial of service (NULL     pointer dereference and daemon crash) by specifying KADM5_POLICY with     a NULL policy name.
    CVE-2015-8631     Multiple memory leaks in kadmin/server/server_stubs.c in kadmind in     MIT Kerberos 5 (aka krb5) before 1.13.4 and 1.14.x before 1.14.1 allow     remote authenticated users to cause a denial of service (memory     consumption) via a request specifying a NULL principal name.
    Security Fix(es):

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

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

This update for krb5 fixes the following issues :

  - CVE-2015-8629: Information leak authenticated attackers     with permissions to modify the database (bsc#963968)

  - CVE-2015-8630: An authenticated attacker with permission     to modify a principal entry may have caused kadmind to     crash (bsc#963964)

  - CVE-2015-8631: An authenticated attacker could have     caused a memory leak in auditd by supplying a null     principal name in request (bsc#963975)

This update was imported from the SUSE:SLE-12:Update update project.

Security Fix(es) :

  - A memory leak flaw was found in the krb5_unparse_name()     function of the MIT Kerberos kadmind service. An     authenticated attacker could repeatedly send specially     crafted requests to the server, which could cause the     server to consume large amounts of memory resources,     ultimately leading to a denial of service due to memory     exhaustion. (CVE-2015-8631)

  - An out-of-bounds read flaw was found in the kadmind     service of MIT Kerberos. An authenticated attacker could     send a maliciously crafted message to force kadmind to     read beyond the end of allocated memory, and write the     memory contents to the KDC database if the attacker has     write permission, leading to information disclosure.
    (CVE-2015-8629)

  - A NULL pointer dereference flaw was found in the     procedure used by the MIT Kerberos kadmind service to     store policies: the kadm5_create_principal_3() and     kadm5_modify_principal() function did not ensure that a     policy was given when KADM5_POLICY was set. An     authenticated attacker with permissions to modify the     database could use this flaw to add or modify a     principal with a policy set to NULL, causing the kadmind     service to crash. (CVE-2015-8630)

ID	名称	产品	系列	发布时间	最近更新时间	严重程度
90295	Oracle Linux 7 : krb5 (ELSA-2016-0532)	Nessus	Oracle Linux Local Security Checks	2016/4/1	2024/11/1	medium
90299	RHEL 7 : krb5 (RHSA-2016:0532)	Nessus	Red Hat Local Security Checks	2016/4/1	2021/2/5	high
99775	EulerOS 2.0 SP1 : krb5 (EulerOS-SA-2016-1012)	Nessus	Huawei Local Security Checks	2017/5/1	2025/12/23	medium
301200	NewStart CGSL MAIN 6.06 (SP) : krb5 Multiple Vulnerabilities (NS-SA-2026-0007)	Nessus	NewStart CGSL Local Security Checks	2026/3/6	2026/3/9	critical
88581	Debian DSA-3466-1 : krb5 - security update	Nessus	Debian Local Security Checks	2016/2/5	2021/1/11	high
90275	CentOS 7 : krb5 (CESA-2016:0532)	Nessus	CentOS Local Security Checks	2016/4/1	2021/1/4	high
289887	MiracleLinux 7 : krb5-1.13.2-12.el7 (AXSA:2016-190:01)	Nessus	Miracle Linux Local Security Checks	2026/1/16	2026/1/16	medium
88854	openSUSE Security Update : krb5 (openSUSE-2016-230)	Nessus	SuSE Local Security Checks	2016/2/19	2021/1/19	high
90344	Scientific Linux Security Update : krb5 on SL7.x x86_64 (20160404)	Nessus	Scientific Linux Local Security Checks	2016/4/5	2021/1/14	high

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