USN-2455-1: bsd-mailx vulnerability
7 January 2015
bsd-mailx could be made to run programs if it parsed a specially crafted email address.
- bsd-mailx - simple mail user agent
It was discovered that bsd-mailx contained a feature that allowed
syntactically valid email addresses to be treated as shell commands. A
remote attacker could possibly use this issue with a valid email address to
execute arbitrary commands.
This functionality has now been disabled by default, and can be re-enabled
with the "expandaddr" configuration option. This update alone does not
remove all possibilities of command execution. In environments where
scripts use mailx to process arbitrary email addresses, it is recommended
to modify them to use a "--" separator before the address to properly
handle those that begin with "-". In addition, specifying sendmail options
after the "--" separator is no longer supported, existing scripts may need
to be modified to use the "-a" option instead.
The problem can be corrected by updating your system to the following package versions:
In general, a standard system update will make all the necessary changes.