GLSA-200803-31 : MIT Kerberos 5: Multiple vulnerabilities

Critical Nessus Plugin ID 31671


The remote Gentoo host is missing one or more security-related patches.


The remote host is affected by the vulnerability described in GLSA-200803-31 (MIT Kerberos 5: Multiple vulnerabilities)

Two vulnerabilities were found in the Kerberos 4 support in KDC: A global variable is not set for some incoming message types, leading to a NULL pointer dereference or a double free() (CVE-2008-0062) and unused portions of a buffer are not properly cleared when generating an error message, which results in stack content being contained in a reply (CVE-2008-0063).
Jeff Altman (Secure Endpoints) discovered a buffer overflow in the RPC library server code, used in the kadmin server, caused when too many file descriptors are opened (CVE-2008-0947).
Venustech AD-LAB discovered multiple vulnerabilities in the GSSAPI library: usage of a freed variable in the gss_indicate_mechs() function (CVE-2007-5901) and a double free() vulnerability in the gss_krb5int_make_seal_token_v3() function (CVE-2007-5971).
Impact :

The first two vulnerabilities can be exploited by a remote unauthenticated attacker to execute arbitrary code on the host running krb5kdc, compromise the Kerberos key database or cause a Denial of Service. These bugs can only be triggered when Kerberos 4 support is enabled.
The RPC related vulnerability can be exploited by a remote unauthenticated attacker to crash kadmind, and theoretically execute arbitrary code with root privileges or cause database corruption. This bug can only be triggered in configurations that allow large numbers of open file descriptors in a process.
The GSSAPI vulnerabilities could be exploited by a remote attacker to cause Denial of Service conditions or possibly execute arbitrary code.
Workaround :

Kerberos 4 support can be disabled via disabling the 'krb4' USE flag and recompiling the ebuild, or setting 'v4_mode=none' in the [kdcdefaults] section of /etc/krb5/kdc.conf. This will only work around the KDC related vulnerabilities.


All MIT Kerberos 5 users should upgrade to the latest version:
# emerge --sync # emerge --ask --oneshot --verbose '>=app-crypt/mit-krb5-1.6.3-r1'

See Also

Plugin Details

Severity: Critical

ID: 31671

File Name: gentoo_GLSA-200803-31.nasl

Version: $Revision: 1.14 $

Type: local

Published: 2008/03/26

Modified: 2016/11/11

Dependencies: 12634

Risk Information

Risk Factor: Critical


Base Score: 10

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C

Vulnerability Information

CPE: p-cpe:/a:gentoo:linux:mit-krb5, cpe:/o:gentoo:linux

Required KB Items: Host/local_checks_enabled, Host/Gentoo/release, Host/Gentoo/qpkg-list

Patch Publication Date: 2008/03/24

Reference Information

CVE: CVE-2007-5894, CVE-2007-5971, CVE-2008-0062, CVE-2008-0063, CVE-2008-0947

OSVDB: 43341, 43342, 43343, 43345, 43346

GLSA: 200803-31

CWE: 119, 189, 399