USN-449-1: krb5 vulnerabilities

Ubuntu Security Notice USN-449-1

3rd April, 2007

krb5 vulnerabilities

A security issue affects these releases of Ubuntu and its derivatives:

  • Ubuntu 6.10
  • Ubuntu 6.06 LTS
  • Ubuntu 5.10

Details

The krb5 telnet service did not appropriately verify user names. A
remote attacker could log in as the root user by requesting a specially
crafted user name. (CVE-2007-0956)

The krb5 syslog library did not correctly verify the size of log
messages. A remote attacker could send a specially crafted message and
execute arbitrary code with root privileges. (CVE-2007-0957)

The krb5 administration service was vulnerable to a double-free in the
GSS RPC library. A remote attacker could send a specially crafted
request and execute arbitrary code with root privileges. (CVE-2007-1216)

Update instructions

The problem can be corrected by updating your system to the following package version:

Ubuntu 6.10:
krb5-telnetd 1.4.3-9ubuntu1.2
libkrb53 1.4.3-9ubuntu1.2
libkadm55 1.4.3-9ubuntu1.2
Ubuntu 6.06 LTS:
krb5-telnetd 1.4.3-5ubuntu0.3
libkrb53 1.4.3-5ubuntu0.3
libkadm55 1.4.3-5ubuntu0.3
Ubuntu 5.10:
krb5-telnetd 1.3.6-4ubuntu0.2
libkrb53 1.3.6-4ubuntu0.2
libkadm55 1.3.6-4ubuntu0.2

To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.

In general, a standard system upgrade is sufficient to effect the
necessary changes.

References

CVE-2007-0956, CVE-2007-0957, CVE-2007-1216