Mandriva Linux Security Advisory 2010-129 - The krshd and v4rcp applications in MIT Kerberos 5 (krb5) up to 1.5, and 1.4.x before 1.4.4, when running on Linux and AIX, and Heimdal 0.7.2 and earlier, do not check return codes for setuid calls, which allows local users to gain privileges by causing setuid to fail to drop privileges using attacks such as resource exhaustion. The ftpd and ksu programs in MIT Kerberos 5 (krb5) up to 1.5, and 1.4.x before 1.4.4, and 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. Certain invalid GSS-API tokens can cause a GSS-API acceptor (server) to crash due to a null pointer dereference in the GSS-API library. The updated packages have been patched to correct these issues.
1229d0c29790afa2ad1dd4aa3ac27bed53aaf20094ab9e3f74e7252954698b5dUbuntu Security Notice USN-334-1 - Michael Calmer and Marcus Meissner discovered that several krb5 tools did not check the return values from setuid() system calls. On systems that have configured user process limits, it may be possible for an attacker to cause setuid() to fail via resource starvation. In that situation, the tools will not reduce their privilege levels, and will continue operation as the root user.
12f66fc37c6dc081c7884cf969144db2f616dc6f0bb1fe070d82c2b129fcea1eMandriva Linux Security Advisory MDKSA-2006-139 - A flaw was discovered in some bundled Kerberos-aware packages that would fail to check the results of the setuid() call. This call can fail in some circumstances on the Linux 2.6 kernel if certain user limits are reached, which could be abused by a local attacker to get the applications to continue to run as root, possibly leading to an elevation of privilege.
f029b2aa00bed2d9f30dd82c9b39ee984241d7c19daea742e84df081598b0ebeDebian Security Advisory 1146-1 - In certain application programs packaged in the MIT Kerberos 5 source distribution, calls to setuid() and seteuid() are not always checked for success and which may fail with some PAM configurations. A local user could exploit one of these vulnerabilities to result in privilege escalation. No exploit code is known to exist at this time.
fdf7d56f527f25c74d716fc111873b755285fe60f901c3753bb4d3e0a50eee7eMIT krb5 Security Advisory 2006-001 - In certain application programs packaged in the MIT Kerberos 5 source distribution, calls to setuid() and seteuid() are not always checked for success. A local user could exploit one of these vulnerabilities to result in privilege escalation.
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