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CVE-2012-1015

Status Candidate

Overview

The kdc_handle_protected_negotiation function in the Key Distribution Center (KDC) in MIT Kerberos 5 (aka krb5) 1.8.x, 1.9.x before 1.9.5, and 1.10.x before 1.10.3 attempts to calculate a checksum before verifying that the key type is appropriate for a checksum, which allows remote attackers to execute arbitrary code or cause a denial of service (uninitialized pointer free, heap memory corruption, and daemon crash) via a crafted AS-REQ request.

Related Files

Gentoo Linux Security Advisory 201312-12
Posted Dec 17, 2013
Authored by Gentoo | Site security.gentoo.org

Gentoo Linux Security Advisory 201312-12 - Multiple vulnerabilities have been discovered in MIT Kerberos 5, allowing execution of arbitrary code or Denial of Service. Versions less than 1.11.4 are affected.

tags | advisory, denial of service, arbitrary, vulnerability
systems | linux, gentoo
advisories | CVE-2002-2443, CVE-2012-1014, CVE-2012-1015, CVE-2013-1416, CVE-2013-1417, CVE-2013-1418, CVE-2013-6800
SHA-256 | 2889e0196fe0b9aaeb676d58c3158d721d6a9e4252a764b323f60b1d630fde77
Mandriva Linux Security Advisory 2013-042
Posted Apr 5, 2013
Authored by Mandriva | Site mandriva.com

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.

tags | advisory, denial of service
systems | linux, mandriva
advisories | CVE-2012-1013, CVE-2012-1015, CVE-2013-1415
SHA-256 | 65d7c91ab60b56895fd6c4431a74ebbaeb093af8cc2390162141b1a01ff503bc
Debian Security Advisory 2518-1
Posted Aug 1, 2012
Authored by Debian | Site debian.org

Debian Linux Security Advisory 2518-1 - Emmanuel Bouillon from NCI Agency discovered multiple vulnerabilities in MIT Kerberos, a daemon implementing the network authentication protocol.

tags | advisory, vulnerability, protocol
systems | linux, debian
advisories | CVE-2012-1014, CVE-2012-1015
SHA-256 | c345c3a09eb83c7948689c2f863b0f6c17f32c2ddaaa2bf52d96090953f5df04
MIT krb5 Security Advisory 2012-001
Posted Aug 1, 2012
Site web.mit.edu

MIT krb5 Security Advisory 2012-001 - The MIT krb5 KDC (Key Distribution Center) 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. The MIT krb5 KDC daemon can dereference an uninitialized pointer while processing a malformed AS-REQ, causing the daemon to abnormally terminate. This vulnerability could theoretically lead to the execution of malicious code, but that is believed to be very difficult.

tags | advisory
advisories | CVE-2012-1014, CVE-2012-1015
SHA-256 | c6e678cd6912090035d37e0e943e9a727bca5c72a814f85c04f9e97cff64c21e
Red Hat Security Advisory 2012-1131-01
Posted Jul 31, 2012
Authored by Red Hat | Site access.redhat.com

Red 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.

tags | advisory, remote
systems | linux, redhat
advisories | CVE-2012-1013, CVE-2012-1015
SHA-256 | fc644b1cb9cf0a8750b9b22679610ad70952fe4b170e2844397d3cea0bd64a5a
Ubuntu Security Notice USN-1520-1
Posted Jul 31, 2012
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu 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.

tags | advisory, remote, denial of service, arbitrary
systems | linux, ubuntu
advisories | CVE-2012-1015, CVE-2012-1014, CVE-2012-1013, CVE-2012-1012, CVE-2012-1012, CVE-2012-1013, CVE-2012-1014, CVE-2012-1015
SHA-256 | 230d2bccf2e221f779ebacf8edcc34a5fd7d0176f42f3af106b6b41e010163fd
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