USN-449-1: krb5 vulnerabilities

Releases

• Ubuntu 6.10
• Ubuntu 6.06
• 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 versions:

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

• 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

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

References

• CVE-2007-0956
• CVE-2007-0957
• CVE-2007-1216