--------------------------------------------------------------------- Fedora Update Notification FEDORA-2005-553 2005-07-12 --------------------------------------------------------------------- Product : Fedora Core 4 Name : krb5 Version : 1.4.1 Release : 5 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 4 contains checks within glibc that detect double-free flaws. Therefore, on Fedora Core 4, 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> 1.4.1-5 - 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> 1.4.1-4 - fix double-close in keytab handling - add port of fixes for CAN-2004-0175 to krb5-aware rcp (#151612) * Fri May 13 2005 Nalin Dahyabhai <nalin@xxxxxxxxxx> 1.4.1-3 - prevent spurious EBADF in krshd when stdin is closed by the client while the command is running (#151111) * Fri May 13 2005 Martin Stransky <stransky@xxxxxxxxxx> 1.4.1-2 - add deadlock patch, removed old patch * Fri May 6 2005 Nalin Dahyabhai <nalin@xxxxxxxxxx> 1.4.1-1 - update to 1.4.1, incorporating fixes for CAN-2005-0468 and CAN-2005-0469 - when starting the KDC or kadmind, if KRB5REALM is set via the /etc/sysconfig file for the service, pass it as an argument for the -r flag --------------------------------------------------------------------- This update can be downloaded from: http://download.fedora.redhat.com/pub/fedora/linux/core/updates/4/ e04410b41cb3e1ca5c5de361932d4f43 SRPMS/krb5-1.4.1-5.src.rpm 84ec58abea3e00d6ce09d9fa17bdec44 ppc/krb5-devel-1.4.1-5.ppc.rpm 3b036b4aebe92579c7b0553c6a943c9c ppc/krb5-libs-1.4.1-5.ppc.rpm 4ef4aae46285b2cc7ec2123175dc65d3 ppc/krb5-server-1.4.1-5.ppc.rpm 236c23aa99713ffbcd375be4418a629c ppc/krb5-workstation-1.4.1-5.ppc.rpm 72a70fe522d9945d62acff3b6d62e9c4 ppc/debug/krb5-debuginfo-1.4.1-5.ppc.rpm 819d79e1b3fbd06de75cae397f00c80e ppc/krb5-libs-1.4.1-5.ppc64.rpm 41a16309bae5f43caf50a9c34493c2a9 x86_64/krb5-devel-1.4.1-5.x86_64.rpm 5a733f5e5d35045e4efd44106d36fb5f x86_64/krb5-libs-1.4.1-5.x86_64.rpm 5da17e3e77e3a73ddbb9d68516cf084e x86_64/krb5-server-1.4.1-5.x86_64.rpm 53738638e418c3aba25c0a344e67d0d2 x86_64/krb5-workstation-1.4.1-5.x86_64.rpm 4f7310c5758bd32432db538f5008577d x86_64/debug/krb5-debuginfo-1.4.1-5.x86_64.rpm e35d87893a9b3b22eb15246a4cc88046 x86_64/krb5-libs-1.4.1-5.i386.rpm 2a5f503e74207349f137d1aaf039879c i386/krb5-devel-1.4.1-5.i386.rpm e35d87893a9b3b22eb15246a4cc88046 i386/krb5-libs-1.4.1-5.i386.rpm c6578a1a24fbaf3da0b7724445fdb675 i386/krb5-server-1.4.1-5.i386.rpm 0317f834d5795dbaf9f531ef747d181b i386/krb5-workstation-1.4.1-5.i386.rpm ec1e81cad1d4365febcff9df32be2375 i386/debug/krb5-debuginfo-1.4.1-5.i386.rpm This update can also be installed with the Update Agent; you can launch the Update Agent with the 'up2date' command. ---------------------------------------------------------------------
