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 for ARM 64 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 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 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.

An update of the krb5 package has been released.

krb5, a MIT Kerberos implementation, had several flaws in LDAP DN checking, which could be used to circumvent a DN containership check by supplying special parameters to some calls.

Further an attacker could crash the KDC by making S4U2Self requests.

For Debian 8 'Jessie', these problems have been fixed in version 1.12.1+dfsg-19+deb8u5.

We recommend that you upgrade your krb5 packages.

NOTE: Tenable Network Security has extracted the preceding description block directly from the DLA 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.

----

Fix leak in previous version.

----

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.

The remote Redhat Enterprise Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2018:3071 advisory.

    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.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise 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.

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

  - 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 relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Published	Updated	Severity
121361	Amazon Linux AMI : krb5 (ALAS-2018-1129)	Nessus	Amazon Linux Local Security Checks	1/25/2019	6/26/2024	medium
124886	EulerOS Virtualization for ARM 64 3.0.1.0 : krb5 (EulerOS-SA-2019-1383)	Nessus	Huawei Local Security Checks	5/14/2019	5/23/2024	medium
203167	Photon OS 4.0: Krb5 PHSA-2021-4.0-0102	Nessus	PhotonOS Local Security Checks	7/23/2024	7/23/2024	medium
126183	Photon OS 3.0: Krb5 PHSA-2019-3.0-0020	Nessus	PhotonOS Local Security Checks	6/24/2019	7/24/2024	medium
121399	Debian DLA-1643-1 : krb5 security update	Nessus	Debian Local Security Checks	1/28/2019	1/11/2021	medium
106908	Fedora 27 : krb5 (2018-391a1f3e61)	Nessus	Fedora Local Security Checks	2/21/2018	1/6/2021	medium
118523	RHEL 7 : krb5 (RHSA-2018:3071)	Nessus	Red Hat Local Security Checks	10/31/2018	11/5/2024	medium
119188	Scientific Linux Security Update : krb5 on SL7.x x86_64 (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
221904	Linux Distros Unpatched Vulnerability : CVE-2018-5729	Nessus	Misc.	3/4/2025	3/4/2025	medium
126181	Photon OS 2.0: Krb5 PHSA-2019-2.0-0164	Nessus	PhotonOS Local Security Checks	6/24/2019	7/23/2024	medium
126187	Photon OS 1.0: Krb5 PHSA-2019-1.0-0239	Nessus	PhotonOS Local Security Checks	6/24/2019	5/19/2022	medium

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