Ubuntu Security Notice 2310-1 - It was discovered that Kerberos incorrectly handled certain crafted Draft 9 requests. A remote attacker could use this issue to cause the daemon to crash, resulting in a denial of service. This issue only affected Ubuntu 12.04 LTS. It was discovered that Kerberos incorrectly handled certain malformed KRB5_PADATA_PK_AS_REQ AS-REQ requests. A remote attacker could use this issue to cause the daemon to crash, resulting in a denial of service. This issue only affected Ubuntu 10.04 LTS and Ubuntu 12.04 LTS. Various other issues were also addressed.
58d3eb1fd12379457b7d374a0622ac5c590760d80a72c972ae312eb6169fd50cMandriva Linux Security Advisory 2013-157 - The pkinit_check_kdc_pkid function in plugins/preauth/pkinit/pkinit_crypto_openssl.c in the PKINIT implementation in the Key Distribution Center in MIT Kerberos 5 before 1.10.4 and 1.11.x before 1.11.1 does not properly handle errors during extraction of fields from an X.509 certificate, which allows remote attackers to cause a denial of service via a malformed KRB5_PADATA_PK_AS_REQ AS-REQ request. The prep_reprocess_req function in do_tgs_req.c in the Key Distribution Center before 1.10.5 does not properly perform service-principal realm referral, which allows remote authenticated users to cause a denial of service (NULL pointer dereference and daemon crash) via a crafted TGS-REQ request. The updated packages have been patched to correct these issues.
199f5a10f9c3952ec28914507f3f5a6dc8411e3c44dfd7e08218fe1c6eb08789Mandriva 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 2013-0656-01 - 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. When a client attempts to use PKINIT to obtain credentials from the KDC, the client can specify, using an issuer and serial number, which of the KDC's possibly-many certificates the client has in its possession, as a hint to the KDC that it should use the corresponding key to sign its response. If that specification was malformed, the KDC could attempt to dereference a NULL pointer and crash.
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