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

  - A Reachable Assertion issue was discovered in the KDC in MIT Kerberos 5 (aka krb5) before 1.17. If an     attacker can obtain a krbtgt ticket using an older encryption type (single-DES, triple-DES, or RC4), the     attacker can crash the KDC by making an S4U2Self request. (CVE-2018-20217)

  - 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)

  - 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)

  - The Key Distribution Center (KDC) in MIT Kerberos 5 (aka krb5) before 1.18.5 and 1.19.x before 1.19.3 has     a NULL pointer dereference in kdc/do_tgs_req.c via a FAST inner body that lacks a server field.
    (CVE-2021-37750)

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

The remote Redhat Enterprise Linux 5 host has one or more packages installed that are affected by multiple vulnerabilities that have been acknowledged by the vendor but will not be patched.

  - krb5: kadmind doubly frees partial deserialization results (MITKRB5-SA-2015-001) (CVE-2014-9421)

  - krb5: Automatic sec context deletion could lead to double-free (CVE-2017-11462)

  - The kadm5_randkey_principal_3 function in lib/kadm5/srv/svr_principal.c in kadmind in MIT Kerberos 5 (aka     krb5) before 1.13 sends old keys in a response to a -randkey -keepold request, which allows remote     authenticated users to forge tickets by leveraging administrative access. (CVE-2014-5351)

Note that Nessus has not tested for these issues but has instead relied on the package manager's report that the package is installed.

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

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

----

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 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.

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)

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.

The remote Redhat Enterprise Linux 6 host has one or more packages installed that are affected by multiple vulnerabilities that have been acknowledged by the vendor but will not be patched.

  - krb5: Automatic sec context deletion could lead to double-free (CVE-2017-11462)

  - The kadm5_randkey_principal_3 function in lib/kadm5/srv/svr_principal.c in kadmind in MIT Kerberos 5 (aka     krb5) before 1.13 sends old keys in a response to a -randkey -keepold request, which allows remote     authenticated users to forge tickets by leveraging administrative access. (CVE-2014-5351)

  - lib/gssapi/spnego/spnego_mech.c in MIT Kerberos 5 (aka krb5) before 1.14 relies on an inappropriate     context handle, which allows remote attackers to cause a denial of service (incorrect pointer read and     process crash) via a crafted SPNEGO packet that is mishandled during a gss_inquire_context call.
    (CVE-2015-2695)

Note that Nessus has not tested for these issues but has instead relied on the package manager's report that the package is installed.

ID	名稱	產品	系列	已發布	已更新	嚴重性
153808	Debian DLA-2771-1 : krb5 - LTS security update	Nessus	Debian Local Security Checks	2021/10/1	2022/7/19	medium
199152	RHEL 5 : krb5 (Unpatched Vulnerability)	Nessus	Red Hat Local Security Checks	2024/6/3	2024/6/3	critical
106908	Fedora 27 : krb5 (2018-391a1f3e61)	Nessus	Fedora Local Security Checks	2018/2/21	2021/1/6	medium
118523	RHEL 7 : krb5 (RHSA-2018:3071)	Nessus	Red Hat Local Security Checks	2018/10/31	2022/2/1	medium
119188	Scientific Linux Security Update : krb5 on SL7.x x86_64 (20181030)	Nessus	Scientific Linux Local Security Checks	2018/11/27	2020/7/1	medium
119784	Amazon Linux 2 : krb5 (ALAS-2018-1129)	Nessus	Amazon Linux Local Security Checks	2018/12/20	2020/3/27	medium
123870	EulerOS Virtualization 2.5.3 : krb5 (EulerOS-SA-2019-1184)	Nessus	Huawei Local Security Checks	2019/4/9	2024/6/4	medium
199166	RHEL 6 : krb5 (Unpatched Vulnerability)	Nessus	Red Hat Local Security Checks	2024/6/3	2024/6/3	critical

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