Ubuntu Security Notice USN-778-1
1st June, 2009
cron vulnerability
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 9.04
- Ubuntu 8.10
- Ubuntu 8.04 LTS
- Ubuntu 6.06 LTS
Software description
- cron
Details
It was discovered that cron did not properly check the return code of
the setgid() and initgroups() system calls. A local attacker could use
this to escalate group privileges. Please note that cron versions 3.0pl1-64
and later were already patched to address the more serious setuid() check
referred to by CVE-2006-2607.
Update instructions
The problem can be corrected by updating your system to the following package version:
- Ubuntu 9.04:
- cron 3.0pl1-105ubuntu1.1
- Ubuntu 8.10:
- cron 3.0pl1-104+ubuntu5.1
- Ubuntu 8.04 LTS:
- cron 3.0pl1-100ubuntu2.1
- Ubuntu 6.06 LTS:
- cron 3.0pl1-92ubuntu1.1
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.