|| ||Yellow Dog Security Advisory: YDU-20030304-1|
|| ||Tue, 4 Mar 2003 14:02:29 -0700 (MST)|
Yellow Dog Linux Security Announcement
Issue Date: March 04, 2003
Advisory ID: YDU-20030304-1
Updated sendmail packages are available.
"During a code audit of Sendmail by ISS, a critical vulnerability was
uncovered that affects unpatched versions of Sendmail prior to version
8.12.8. A remote attacker can send a carefully crafted email message
which, when processed by sendmail, causes arbitrary code to be
executed as root.
We are advised that a proof-of-concept exploit is known to exist, but
is not believed to be in the wild.
Since this is a message-based vulnerability, MTAs other than Sendmail
may pass on the carefully crafted message. This means that unpatched
versions of Sendmail inside a network could still be at risk even if
they do not accept external connections directly.
In addition, the restricted shell (SMRSH) in Sendmail allows attackers to
bypass the intended restrictions of smrsh by inserting additional commands
after "||" sequences or "/" characters, which are not properly filtered or
verified. A sucessful attack would allow an attacker who has a local
account on a system which has explicitly enabled smrsh to execute arbitrary
binaries as themselves by utilizing their .forward file.
All users are advised to update to these erratum packages."
(from Red Hat Advisory)
a) Updating via apt...
We suggest that you use the apt-get program to keep your
system up-to-date. The following command(s) will retrieve
and install the fixed version of this update onto your system:
apt-get install sendmail
b) Updating manually...
Download the updates below and then run the following rpm command.
(Please use a mirror site)
rpm -Fvh [filenames]
MD5 checksum Package
I wish to verify that each package has not been corrupted or tampered with,
examine the md5sum with the following command: rpm --checksig --nogpg filename
Terra Soft has setup a moderated mailing list where these security, bugfix, and package
enhancement announcements will be posted. See http://lists.terrasoftsolutions.com/ for more
For information regarding the usage of apt-get, see:
yellowdog-updates mailing list
to post comments)