MIT krb5 1.6 or later allows an authenticated kadmin with permission to add principals to an LDAP Kerberos database to circumvent a DN containership check by supplying both a 'linkdn' and 'containerdn' database argument, or by supplying a DN string which is a left extension of a container DN string but is not hierarchically within the container DN.(CVE-2018-5730)

MIT krb5 1.6 or later allows an authenticated kadmin with permission to add principals to an LDAP Kerberos database to cause a denial of service (NULL pointer dereference) or bypass a DN container check by supplying tagged data that is internal to the database module.(CVE-2018-5729)

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

  - MIT krb5 1.6 or later allows an authenticated kadmin     with permission to add principals to an LDAP Kerberos     database to cause a denial of service (NULL pointer     dereference) or bypass a DN container check by     supplying tagged data that is internal to the database     module.i1/4^CVE-2018-5729i1/4%0

  - MIT krb5 1.6 or later allows an authenticated kadmin     with permission to add principals to an LDAP Kerberos     database to circumvent a DN containership check by     supplying both a 'linkdn' and 'containerdn' database     argument, or by supplying a DN string which is a left     extension of a container DN string but is not     hierarchically within the container     DN.i1/4^CVE-2018-5730i1/4%0

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.

Fix CVE-2018-5729, CVE-2018-5730.

These are low-impact, requiring administrator access to exploit.

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Fix leak in previous version.

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Always read config snippets in alphabetical order per-directory.

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

An update of the krb5 package has been released.

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 Low. 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) :

* krb5: null dereference in kadmind or DN container check bypass by supplying special crafted data (CVE-2018-5729)

* krb5: DN container check bypass by supplying special crafted data (CVE-2018-5730)

For more details about the security issue(s), including the impact, a CVSS score, and other related information, refer to the CVE page(s) listed in the References section.

Additional Changes :

For detailed information on changes in this release, see the Red Hat Enterprise Linux 7.6 Release Notes linked from the References section.

The remote NewStart CGSL host, running version CORE 5.04 / MAIN 5.04, has krb5 packages installed that are affected by multiple vulnerabilities:

  - MIT krb5 1.6 or later allows an authenticated kadmin     with permission to add principals to an LDAP Kerberos     database to circumvent a DN containership check by     supplying both a linkdn and containerdn database     argument, or by supplying a DN string which is a left     extension of a container DN string but is not     hierarchically within the container DN. (CVE-2018-5730)

  - MIT krb5 1.6 or later allows an authenticated kadmin     with permission to add principals to an LDAP Kerberos     database to cause a denial of service (NULL pointer     dereference) or bypass a DN container check by supplying     tagged data that is internal to the database module.
    (CVE-2018-5729)

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

This update for krb5 provides the following fixes :

Security issues fixed :

  - CVE-2018-5730: DN container check bypass by supplying     special crafted data (bsc#1083927).

  - CVE-2018-5729: NULL pointer dereference in kadmind or DN     container check bypass by supplying special crafted data     (bsc#1083926).

Non-security issues fixed :

  - Make it possible for legacy applications (e.g. SAP     Netweaver) to remain compatible with newer Kerberos.
    System administrators who are experiencing this kind of     compatibility issues may set the environment variable     GSSAPI_ASSUME_MECH_MATCH to a non-empty value, and make     sure the environment variable is visible and effective     to the application startup script. (bsc#1057662)

  - Fix a GSS failure in legacy applications by not     indicating deprecated GSS mechanisms in     gss_indicate_mech() list. (bsc#1081725)

This update was imported from the SUSE:SLE-12-SP2:Update update project.

The remote Debian 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the dla-2771 advisory.

    Several vulnerabilities were fixed in MIT Kerberos, a system for authenticating users and services on a     network. CVE-2018-5729 CVE-2018-5730 Fix flaws in LDAP DN checking. CVE-2018-20217 Ignore password     attributes for S4U2Self requests. CVE-2021-37750 Fix KDC null deref on TGS inner body null server. For     Debian 9 stretch, these problems have been fixed in version 1.15-1+deb9u3. We recommend that you upgrade     your krb5 packages. For the detailed security status of krb5 please refer to its security tracker page at:
    https://security-tracker.debian.org/tracker/krb5 Further information about Debian LTS security advisories,     how to apply these updates to your system and frequently asked questions can be found at:
    https://wiki.debian.org/LTS

Tenable has extracted the preceding description block directly from the Debian 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 NewStart CGSL host, running version MAIN 6.06, 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.

krb5 的更新现在可用于 Red Hat Enterprise Linux 7。Red Hat 产品安全团队将此更新评级为具有低等安全影响。可从“参考”部分中的 CVE 链接获取通用漏洞评分系统 (CVSS) 基本分数，其针对每个漏洞给出了详细的严重性等级。Kerberos 是一种网络认证系统，该系统可通过消除在网络上发送未加密密码的非安全行为提升网络的安全性。它允许客户端和服务器使用受信任的第三方（即 Kerberos 密钥分发中心 KDC）对彼此进行身份验证。安全修复：* krb5：通过提供特制数据，导致 kadmind 内的空取消引用或 DN 容器检查绕过 (CVE-2018-5729) * krb5：通过提供特制数据，发现 DN 容器检查绕过 (CVE-2018-5730) 有关此安全问题的详细信息，包括其影响、CVSS 分数和其他相关信息，请参阅列于“参考”部分的 CVE 页面。其他更改：如需有关此版本的详细变更信息，请参阅可从“参考”部分链接的 Red Hat Enterprise Linux 7.6 版本说明。

安全修复：

  - krb5：通过提供特制数据，在 kadmind 或 DN 容器中存在空取消引用 (CVE-2018-5729)

  - krb5：通过提供特制数据的 DN 容器检查绕过 (CVE-2018-5730)

MIT krb5 1.6 或更新版本允许拥有权限可将主体添加至 LDAP Kerberos 数据库的经验证 kadmin 避开 DN 容器检查，方法是同时提供 ‘linkdn’ 和 ‘containerdn’ 数据库参数，或提供一个 DN 字符串，该字符串是容器 DN 字符串的左扩展，但在容器 DN 内没有层次结构。(CVE-2018-5730) MIT krb5 1.6 或更新版本允许拥有权限可将主体添加至 LDAP Kerberos 数据库的经验证 kadmin，通过提供数据库模块内部的标记数据，造成拒绝服务（空指针取消引用）或绕过 DN 容器检查。(CVE-2018-5729)

根据安装的 krb5 程序包版本，远程主机上安装的 EulerOS Virtualization 会受到下列漏洞影响：- MIT krb5 1.6 或更新版本允许拥有权限可将主体添加至 LDAP Kerberos 数据库的经验证 kadmin，通过提供数据库模块内部的标记数据，造成拒绝服务（空指针取消引用）或绕过 DN 容器检查。(CVE-2018-5729) - MIT krb5 1.6 或更新版本允许拥有权限可将主体添加至 LDAP Kerberos 数据库的经验证 kadmin 避开 DN 容器检查，方法是同时提供“linkdn”和“containerdn”数据库参数，或提供一个 DN 字符串，该字符串是容器 DN 字符串的左扩展，但在容器 DN 内没有层次结构。(CVE-2018-5730) 请注意，Tenable Network Security 已直接从 EulerOS 安全公告中提取上述描述块。Tenable 已尝试在不引入其他问题的情况下尽可能进行了自动整理和排版。

ID	Name	Product	Family	Published	Updated	Severity
119784	Amazon Linux 2 : krb5 (ALAS-2018-1129)	Nessus	Amazon Linux Local Security Checks	12/20/2018	7/15/2024	medium
123870	EulerOS Virtualization 2.5.3 : krb5 (EulerOS-SA-2019-1184)	Nessus	Huawei Local Security Checks	4/9/2019	6/4/2024	medium
106908	Fedora 27 : krb5 (2018-391a1f3e61)	Nessus	Fedora Local Security Checks	2/21/2018	10/29/2025	medium
121987	Photon OS 2.0: Krb5 PHSA-2018-2.0-0087	Nessus	PhotonOS Local Security Checks	2/7/2019	7/22/2024	low
118988	CentOS 7 : krb5 (CESA-2018:3071)	Nessus	CentOS Local Security Checks	11/16/2018	4/8/2021	medium
127266	NewStart CGSL CORE 5.04 / MAIN 5.04 : krb5 Multiple Vulnerabilities (NS-SA-2019-0067)	Nessus	NewStart CGSL Local Security Checks	8/12/2019	1/14/2021	medium
108783	openSUSE Security Update : krb5 (openSUSE-2018-328)	Nessus	SuSE Local Security Checks	4/2/2018	11/21/2024	medium
153808	Debian DLA-2771-1 : krb5 - LTS security update	Nessus	Debian Local Security Checks	10/1/2021	1/24/2025	medium
266225	NewStart CGSL MAIN 6.06 : krb5 Multiple Vulnerabilities (NS-SA-2025-0215)	Nessus	NewStart CGSL Local Security Checks	9/30/2025	10/1/2025	critical
118523	RHEL 7 : krb5 (RHSA-2018:3071)	Nessus	Red Hat Local Security Checks	10/31/2018	11/5/2024	medium
119188	Scientific Linux 安全更新：SL7.x x86_64 上的 krb5 (20181030)	Nessus	Scientific Linux Local Security Checks	11/27/2018	7/18/2024	medium
119784	Amazon Linux 2 : krb5 (ALAS-2018-1129)	Nessus	Amazon Linux Local Security Checks	12/20/2018	7/15/2024	medium
123870	EulerOS Virtualization 2.5.3：krb5 (EulerOS-SA-2019-1184)	Nessus	Huawei Local Security Checks	4/9/2019	6/4/2024	medium

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