Sendmail Trojan Horse Vulnerability<br />Risk <br />High<br /><br />Date Discovered <br />10-08-2002<br /><br />Description <br /><br />Reportedly, the server hosting sendmail, ftp.sendmail.org, was compromised recently. It has been reported that the intruder made modifications to the source code of sendmail to include Trojan Horse code. Downloads of the sendmail source code from ftp.sendmail.org between September 28, 2002 and October 6, 2002 likely contain the trojan code.<br /><br />It has also been reported that versions of sendmail available via HTTP distribution on the Sendmail Consortium site are not affected.<br /><br />Reports say that the trojan will run once upon compilation of sendmail. Once the Trojan is executed, it attempts to connect to host spatula.aclue.com (66.37.138.99) on port 6667.<br /><br />Although unconfirmed, it has been reported that the service listening on port 6667 of host spatula.aclue.com (66.37.138.99) has been disabled.<br /><br />The Sendmail Consortium has signed all valid distributions of the sendmail software with the following PGP key:<br /><br />pub 1024R/678C0A03 2001-12-18 Sendmail Signing Key/2002 <br />Key fingerprint = 7B 02 F4 AA FC C0 22 DA 47 3E 2A 9A 9B 35 22 45 <br /><br />Additionally, the following checksums have been made available to verify packages against:<br /><br />73e18ea78b2386b774963c8472cbd309 sendmail.8.12.6.tar.gz<br />cebe3fa43731b315908f44889d9d2137 sendmail.8.12.6.tar.Z<br />8b9c78122044f4e4744fc447eeafef34 sendmail.8.12.6.tar.sig <br />Components Affected <br />Sendmail Consortium Sendmail 8.12.6 <br /><br />Recommendations <br />Block external access at the network boundary, unless service is required by external parties.<br />Filter untrusted network traffic at border routers and network firewalls.<br /><br />Run all server processes as non-privileged users with minimal access rights.<br />Perform all tasks with the minimal privileges possible to perform task.<br /><br />The vendor has stated that the versions served via HTTP download are not affected, and the valid versions of sendmail for downloaded from
http://www.sendmail.org. They are available from the normal distribution channels and have the following MD5 checksums:<br /><br />73e18ea78b2386b774963c8472cbd309 sendmail.8.12.6.tar.gz<br />cebe3fa43731b315908f44889d9d2137 sendmail.8.12.6.tar.Z<br />8b9c78122044f4e4744fc447eeafef34 sendmail.8.12.6.tar.sig<br /><br />Additionally, they are signed with the Sendmail Consortium PGP Key. <br />Sendmail Consortium Sendmail 8.12.6: <br /><br />References <br />Source: CERT CA-2002-28 Trojan Horse Sendmail Distribution <br />URL:
http://online.securityfocus.com/advisories/4541 <br /><br />Source: Re: CERT Advisory CA-2002-28 Trojan Horse Sendmail <br />URL: msg://bugtraq/Pine.GSO.4.44.0210081944270.18276-100000@mindsec.com <br /><br />Source: Sendmail Homepage <br />URL:
http://www.sendmail.org/ <br /><br />Credits <br />Advisory released by CERT.
