| <?xml version="1.0" encoding="utf-8"?> |
| <!DOCTYPE glsa SYSTEM "http://www.gentoo.org/dtd/glsa.dtd"> |
| |
| <glsa id="200606-19"> |
| <title>Sendmail: Denial of Service</title> |
| <synopsis> |
| Faulty multipart MIME messages can cause forked Sendmail processes to |
| crash. |
| </synopsis> |
| <product type="ebuild">sendmail</product> |
| <announced>June 15, 2006</announced> |
| <revised>June 15, 2006: 01</revised> |
| <bug>135141</bug> |
| <access>remote</access> |
| <affected> |
| <package name="mail-mta/sendmail" auto="yes" arch="*"> |
| <unaffected range="ge">8.13.6-r1</unaffected> |
| <vulnerable range="lt">8.13.6-r1</vulnerable> |
| </package> |
| </affected> |
| <background> |
| <p> |
| Sendmail is a popular mail transfer agent (MTA). |
| </p> |
| </background> |
| <description> |
| <p> |
| Frank Sheiness discovered that the mime8to7() function can recurse |
| endlessly during the decoding of multipart MIME messages until the |
| stack of the process is filled and the process crashes. |
| </p> |
| </description> |
| <impact type="normal"> |
| <p> |
| By sending specially crafted multipart MIME messages, a remote |
| attacker can cause a subprocess forked by Sendmail to crash. If |
| Sendmail is not set to use a randomized queue processing, the attack |
| will effectively halt the delivery of queued mails as well as the |
| malformed one, incoming mail delivered interactively is not affected. |
| Additionally, on systems where core dumps with an individual naming |
| scheme (like "core.pid") are enabled, a filesystem may fill up with |
| core dumps. Core dumps are disabled by default in Gentoo. |
| </p> |
| </impact> |
| <workaround> |
| <p> |
| The Sendmail 8.13.7 release information offers some workarounds, please |
| see the Reference below. Note that the issue has actually been fixed in |
| the 8.13.6-r1 ebuild. |
| </p> |
| </workaround> |
| <resolution> |
| <p> |
| All Sendmail users should upgrade to the latest version: |
| </p> |
| <code> |
| # emerge --sync |
| # emerge --ask --oneshot --verbose ">=mail-mta/sendmail-8.13.6-r1"</code> |
| </resolution> |
| <references> |
| <uri link="http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-1173">CVE-2006-1173</uri> |
| <uri link="http://www.sendmail.org/releases/8.13.7.html">Sendmail 8.13.7 release information</uri> |
| </references> |
| <metadata tag="requester" timestamp="Wed, 14 Jun 2006 18:47:59 +0000"> |
| jaervosz |
| </metadata> |
| <metadata tag="submitter" timestamp="Wed, 14 Jun 2006 19:21:03 +0000"> |
| frilled |
| </metadata> |
| <metadata tag="bugReady" timestamp="Thu, 15 Jun 2006 16:00:46 +0000"> |
| jaervosz |
| </metadata> |
| </glsa> |