--------------------------------------------------------------------- Fedora Update Notification FEDORA-2005-552 2005-07-12 --------------------------------------------------------------------- Product : Fedora Core 3 Name : krb5 Version : 1.3.6 Release : 7 Summary : The Kerberos network authentication system. Description : Kerberos V5 is a trusted-third-party network authentication system, which can improve your network's security by eliminating the insecure practice of cleartext passwords. --------------------------------------------------------------------- Update Information: A double-free flaw was found in the krb5_recvauth() routine which may be triggered by a remote unauthenticated attacker. Fedora Core 3 contains checks within glibc that detect double-free flaws. Therefore, on Fedora Core 3, successful exploitation of this issue can only lead to a denial of service (KDC crash). The Common Vulnerabilities and Exposures project assigned the name CAN-2005-1689 to this issue. Daniel Wachdorf discovered a single byte heap overflow in the krb5_unparse_name() function, part of krb5-libs. Successful exploitation of this flaw would lead to a denial of service (crash). To trigger this flaw remotely, an attacker would need to have control of a kerberos realm that shares a cross-realm key with the target, making exploitation of this flaw unlikely. (CAN-2005-1175). Daniel Wachdorf also discovered that in error conditions that may occur in response to correctly-formatted client requests, the Kerberos 5 KDC may attempt to free uninitialized memory. This could allow a remote attacker to cause a denial of service (KDC crash) (CAN-2005-1174). Gaël Delalleau discovered an information disclosure issue in the way some telnet clients handle messages from a server. An attacker could construct a malicious telnet server that collects information from the environment of any victim who connects to it using the Kerberos-aware telnet client (CAN-2005-0488). The rcp protocol allows a server to instruct a client to write to arbitrary files outside of the current directory. This could potentially cause a security issue if a user uses the Kerberos-aware rcp to copy files from a malicious server (CAN-2004-0175). --------------------------------------------------------------------- * Wed Jun 29 2005 Nalin Dahyabhai <nalin@xxxxxxxxxx> 1.3.6-7 - fix telnet client environment variable disclosure the same way NetKit's telnet client did (CAN-2005-0488) (#159305) - keep apps which call krb5_principal_compare() or krb5_realm_compare() with malformed or NULL principal structures from crashing outright (Thomas Biege) (#161475) * Tue Jun 28 2005 Nalin Dahyabhai <nalin@xxxxxxxxxx> - apply fixes from draft of MIT-KRB5-SA-2005-002 (CAN-2005-1174,CAN-2005-1175) (#157104) - apply fixes from draft of MIT-KRB5-SA-2005-003 (CAN-2005-1689) (#159755) * Fri Jun 24 2005 Nalin Dahyabhai <nalin@xxxxxxxxxx> 1.3.6-6 - fix double-close in keytab handling - add port of fixes for CAN-2004-0175 to krb5-aware rcp (#151612) --------------------------------------------------------------------- This update can be downloaded from: http://download.fedora.redhat.com/pub/fedora/linux/core/updates/3/ bbda806f94b4d1833d9fd884844f43da SRPMS/krb5-1.3.6-7.src.rpm 1d9290dc2b92c62cebdd46ff27ed26f4 x86_64/krb5-devel-1.3.6-7.x86_64.rpm 1ee1d026aabc242677f91dccdf94558b x86_64/krb5-libs-1.3.6-7.x86_64.rpm a31aad264eeecd22a73e5dc1ddc9ed77 x86_64/krb5-server-1.3.6-7.x86_64.rpm 87f60cb9bf65e7aeaa766ae33ff6a83c x86_64/krb5-workstation-1.3.6-7.x86_64.rpm 1a8bc195545e1bd5d9de79efae04fb38 x86_64/debug/krb5-debuginfo-1.3.6-7.x86_64.rpm efa02df806c2730d4aadf47ea9502dfc x86_64/krb5-libs-1.3.6-7.i386.rpm 6c8f97b7bd66f752f60ee3e974613424 i386/krb5-devel-1.3.6-7.i386.rpm efa02df806c2730d4aadf47ea9502dfc i386/krb5-libs-1.3.6-7.i386.rpm 681ebd995cce6cf33adcafc6c8d2f1f7 i386/krb5-server-1.3.6-7.i386.rpm 2f999eff92ca4885ba38dfc6b00286c9 i386/krb5-workstation-1.3.6-7.i386.rpm a32f85ca5a135626840d0034f407b39d i386/debug/krb5-debuginfo-1.3.6-7.i386.rpm This update can also be installed with the Update Agent; you can launch the Update Agent with the 'up2date' command. ---------------------------------------------------------------------
