SynopsisThe remote Debian host is missing a security update.
DescriptionTwo security vulnerabilities were discovered in Heirloom mailx, an implementation of the 'mail' command :
mailx interprets interprets shell meta-characters in certain email addresses.
An unexpected feature of mailx treats syntactically valid email addresses as shell commands to execute.
Shell command execution can be re-enabled using the 'expandaddr' option.
Note that this security update does not remove all mailx facilities for command execution, though. Scripts which send mail to addresses obtained from an untrusted source (such as a web form) should use the '--' separator before the email addresses (which was fixed to work properly in this update), or they should be changed to invoke 'mail
-t' or 'sendmail -i -t' instead, passing the recipient addresses as part of the mail header.
For the oldstable distribution (squeeze), these problems have been fixed in version 12.4-2+deb6u1.
We recommend that you upgrade your heirloom-mailx packages.
NOTE: Tenable Network Security has extracted the preceding description block directly from the DLA security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.
SolutionUpgrade the affected heirloom-mailx package.