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.

An update of the krb5 package has been released.

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.

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.

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 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.

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.

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.

This update for krb5 fixes the following issues :

Security issues fixed :

  - CVE-2018-5729, CVE-2018-5730: Fixed multiple flaws in     LDAP DN checking (bsc#1083926, bsc#1083927)

This update was imported from the SUSE:SLE-15:Update update project.

This update for krb5 fixes the following issues :

Security issues fixed :

CVE-2018-5729, CVE-2018-5730: Fixed multiple flaws in LDAP DN checking (bsc#1083926, bsc#1083927)

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

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.

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 installation on the remote host is affected by the following vulnerabilities :

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

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

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.

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 installation on the remote host is affected by the following vulnerabilities :

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

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

  - A stack based buffer overflow was found in the     get_matching_data() function, when reading the     principal's certificate during pkinit     preauthentication. If the Certifcate Authority's     subject line is sufficiently long, an attacker able to     have a specially crafted certificate signed could crash     the authentication process, such as kinit, or,     possibly, run arbitrary code.(CVE-2017-15088 )

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.

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)

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 Oracle Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2018-3071 advisory.

    - Fix flaws in LDAP DN checking (CVE-2018-5729, CVE-2018-5730)

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.

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.

This update for krb5 fixes several issues. This security issue was fixed :

  - CVE-2017-11462: Prevent automatic security context     deletion to prevent double-free (bsc#1056995).

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

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

The update package also includes non-security fixes. See advisory for details.

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

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.

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)

Note that Tenable Network Security has extracted the preceding description block directly from the SUSE 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.

ID	Name	Product	Family	Severity
203570	Photon OS 5.0: Krb5 PHSA-2023-5.0-0062	Nessus	PhotonOS Local Security Checks	medium
203167	Photon OS 4.0: Krb5 PHSA-2021-4.0-0102	Nessus	PhotonOS Local Security Checks	medium
199166	RHEL 6 : krb5 (Unpatched Vulnerability)	Nessus	Red Hat Local Security Checks	critical
199152	RHEL 5 : krb5 (Unpatched Vulnerability)	Nessus	Red Hat Local Security Checks	critical
153808	Debian DLA-2771-1 : krb5 - LTS security update	Nessus	Debian Local Security Checks	medium
127266	NewStart CGSL CORE 5.04 / MAIN 5.04 : krb5 Multiple Vulnerabilities (NS-SA-2019-0067)	Nessus	NewStart CGSL Local Security Checks	medium
126187	Photon OS 1.0: Krb5 PHSA-2019-1.0-0239	Nessus	PhotonOS Local Security Checks	medium
126183	Photon OS 3.0: Krb5 PHSA-2019-3.0-0020	Nessus	PhotonOS Local Security Checks	medium
126181	Photon OS 2.0: Krb5 PHSA-2019-2.0-0164	Nessus	PhotonOS Local Security Checks	medium
124886	EulerOS Virtualization for ARM 64 3.0.1.0 : krb5 (EulerOS-SA-2019-1383)	Nessus	Huawei Local Security Checks	medium
123870	EulerOS Virtualization 2.5.3 : krb5 (EulerOS-SA-2019-1184)	Nessus	Huawei Local Security Checks	medium
121609	openSUSE Security Update : krb5 (openSUSE-2019-139)	Nessus	SuSE Local Security Checks	medium
121416	SUSE SLED15 / SLES15 Security Update : krb5 (SUSE-SU-2019:0175-1)	Nessus	SuSE Local Security Checks	medium
121399	Debian DLA-1643-1 : krb5 security update	Nessus	Debian Local Security Checks	medium
121361	Amazon Linux AMI : krb5 (ALAS-2018-1129)	Nessus	Amazon Linux Local Security Checks	medium
119914	EulerOS 2.0 SP2 : krb5 (EulerOS-SA-2018-1425)	Nessus	Huawei Local Security Checks	medium
119784	Amazon Linux 2 : krb5 (ALAS-2018-1129)	Nessus	Amazon Linux Local Security Checks	medium
119526	EulerOS 2.0 SP3 : krb5 (EulerOS-SA-2018-1398)	Nessus	Huawei Local Security Checks	critical
119188	Scientific Linux Security Update : krb5 on SL7.x x86_64 (20181030)	Nessus	Scientific Linux Local Security Checks	medium
118988	CentOS 7 : krb5 (CESA-2018:3071)	Nessus	CentOS Local Security Checks	medium
118768	Oracle Linux 7 : krb5 (ELSA-2018-3071)	Nessus	Oracle Linux Local Security Checks	medium
118523	RHEL 7 : krb5 (RHSA-2018:3071)	Nessus	Red Hat Local Security Checks	medium
108826	SUSE SLES11 Security Update : krb5 (SUSE-SU-2018:0859-1)	Nessus	SuSE Local Security Checks	critical
108783	openSUSE Security Update : krb5 (openSUSE-2018-328)	Nessus	SuSE Local Security Checks	medium
108747	SUSE SLED12 / SLES12 Security Update : krb5 (SUSE-SU-2018:0846-1)	Nessus	SuSE Local Security Checks	medium
107108	Fedora 26 : krb5 (2018-f97cb1c9b0)	Nessus	Fedora Local Security Checks	medium
106908	Fedora 27 : krb5 (2018-391a1f3e61)	Nessus	Fedora Local Security Checks	medium

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