| <?xml version="1.0" encoding="utf-8"?> |
| <!DOCTYPE glsa SYSTEM "http://www.gentoo.org/dtd/glsa.dtd"> |
| |
| <glsa id="200501-23"> |
| <title>Exim: Two buffer overflows</title> |
| <synopsis> |
| Buffer overflow vulnerabilities, which could lead to arbitrary code |
| execution, have been found in the handling of IPv6 addresses as well as in |
| the SPA authentication mechanism in Exim. |
| </synopsis> |
| <product type="ebuild">exim</product> |
| <announced>January 12, 2005</announced> |
| <revised>January 12, 2005: 01</revised> |
| <bug>76893</bug> |
| <access>remote</access> |
| <affected> |
| <package name="mail-mta/exim" auto="yes" arch="*"> |
| <unaffected range="ge">4.43-r2</unaffected> |
| <vulnerable range="lt">4.43-r2</vulnerable> |
| </package> |
| </affected> |
| <background> |
| <p> |
| Exim is an highly configurable message transfer agent (MTA) |
| developed at the University of Cambridge. |
| </p> |
| </background> |
| <description> |
| <p> |
| Buffer overflows have been found in the host_aton() function |
| (CAN-2005-0021) as well as in the spa_base64_to_bits() function |
| (CAN-2005-0022), which is part of the SPA authentication code. |
| </p> |
| </description> |
| <impact type="high"> |
| <p> |
| A local attacker could trigger the buffer overflow in host_aton() |
| by supplying an illegal IPv6 address with more than 8 components, using |
| a command line option. The second vulnerability could be remotely |
| exploited during SPA authentication, if it is enabled on the server. |
| Both buffer overflows can potentially lead to the execution of |
| arbitrary code. |
| </p> |
| </impact> |
| <workaround> |
| <p> |
| There is no known workaround at this time. |
| </p> |
| </workaround> |
| <resolution> |
| <p> |
| All Exim users should upgrade to the latest version: |
| </p> |
| <code> |
| # emerge --sync |
| # emerge --ask --oneshot --verbose ">=mail-mta/exim-4.43-r2"</code> |
| </resolution> |
| <references> |
| <uri link="http://www.exim.org/mail-archives/exim-announce/2005/msg00000.html">Exim Announcement</uri> |
| <uri link="http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-0021">CAN-2005-0021</uri> |
| <uri link="http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-0022">CAN-2005-0022</uri> |
| </references> |
| <metadata tag="requester" timestamp="Mon, 10 Jan 2005 09:24:16 +0000"> |
| koon |
| </metadata> |
| <metadata tag="submitter" timestamp="Mon, 10 Jan 2005 10:01:20 +0000"> |
| vorlon078 |
| </metadata> |
| <metadata tag="bugReady" timestamp="Wed, 12 Jan 2005 21:52:22 +0000"> |
| koon |
| </metadata> |
| </glsa> |