Mandriva Linux Security Advisory 2013-042 - Fixed a kadmind denial of service issue, which could only be triggered by an administrator with the create privilege. The MIT krb5 KDC daemon can free an uninitialized pointer while processing an unusual AS-REQ, corrupting the process heap and possibly causing the daemon to abnormally terminate. An attacker could use this vulnerability to execute malicious code, but exploiting frees of uninitialized pointers to execute code is believed to be difficult. It is possible that a legitimate client that is misconfigured in an unusual way could trigger this vulnerability. It was reported that the KDC plugin for PKINIT could dereference a NULL pointer when a malformed packet caused processing to terminate early, which led to a crash of the KDC process. An attacker would require a valid PKINIT certificate or have observed a successful PKINIT authentication to execute a successful attack. In addition, an unauthenticated attacker could execute the attack of anonymouse PKINIT was enabled. The updated packages have been patched to correct these issues.
65d7c91ab60b56895fd6c4431a74ebbaeb093af8cc2390162141b1a01ff503bcRed Hat Security Advisory 2012-1131-01 - Kerberos is a network authentication system which allows clients and servers to authenticate to each other using symmetric encryption and a trusted third-party, the Key Distribution Center. An uninitialized pointer use flaw was found in the way the MIT Kerberos KDC handled initial authentication requests. A remote, unauthenticated attacker could use this flaw to crash the KDC via a specially-crafted AS-REQ request. A NULL pointer dereference flaw was found in the MIT Kerberos administration daemon, kadmind. A Kerberos administrator who has the "create" privilege could use this flaw to crash kadmind.
fc644b1cb9cf0a8750b9b22679610ad70952fe4b170e2844397d3cea0bd64a5aUbuntu Security Notice 1520-1 - Emmanuel Bouillon discovered that the MIT krb5 Key Distribution Center (KDC) daemon could free an uninitialized pointer when handling a malformed AS-REQ message. A remote unauthenticated attacker could use this to cause a denial of service or possibly execute arbitrary code. Emmanuel Bouillon discovered that the MIT krb5 Key Distribution Center (KDC) daemon could dereference an uninitialized pointer while handling a malformed AS-REQ message. A remote unauthenticated attacker could use this to cause a denial of service or possibly execute arbitrary code. This issue only affected Ubuntu 12.04 LTS. Various other issues were also addressed.
230d2bccf2e221f779ebacf8edcc34a5fd7d0176f42f3af106b6b41e010163fdMandriva Linux Security Advisory 2012-102 - A vulnerability has been discovered and corrected in krb5. A kadmind denial of service issue has been addressed, which could only be triggered by an administrator with the create privilege. The updated packages have been patched to correct this issue.
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