====================================================================== Secunia Research 20/12/2005
- Pegasus Mail Buffer Overflow and Off-by-One Vulnerabilities - ====================================================================== Table of Contents Affected Software....................................................1 Severity.............................................................2 Description of Vulnerability.........................................3 Solution.............................................................4 Time Table...........................................................5 Credits..............................................................6 References...........................................................7 About Secunia........................................................8 Verification.........................................................9 ====================================================================== 1) Affected Software * Pegasus Mail version 4.21a, 4.21b, and 4.21c. * Pegasus Mail version 4.30PB1 (Public Beta 1). ====================================================================== 2) Severity Rating: Moderately Critical Impact: System access Where: Remote ====================================================================== 3) Description of Vulnerability Secunia Research has discovered two vulnerabilities in Pegasus Mail, which can be exploited by malicious people to compromise a user's system. 1) A boundary error exists when using the reply from a POP3 server to construct trace messages that are displayed to the user if an error occurs when downloading emails. This can be exploited to cause a stack-based buffer overflow via an overly long POP3 reply. Successful exploitation allows arbitrary code execution but requires that the user is e.g. tricked into connecting to a malicious POP3 server. 2) An off-by-one error exists when displaying the RFC2822 message headers of an email to the user. This can be exploited to overwrite the least significant byte of the saved EBP via a email message header that is 1022 bytes or longer. This allows code execution on a Windows XP system. Successful exploitation requires that the user is e.g. tricked into viewing the headers of a malicious email via the "Message headers..." menu item in the context menu of the email message. The vulnerabilities have been confirmed in version 4.21c and 4.30PB1 (Public Beta 1). ====================================================================== 4) Solution Updated to version 4.31. ====================================================================== 5) Time Table 13/12/2005 - Initial vendor notification. 13/12/2005 - Initial vendor reply. 20/12/2005 - Public disclosure. ====================================================================== 6) Credits Discovered by Tan Chew Keong, Secunia Research. ====================================================================== 7) References Pegasus Mail: http://www.pmail.com/newsflash.htm#secunia ====================================================================== 8) About Secunia Secunia collects, validates, assesses, and writes advisories regarding all the latest software vulnerabilities disclosed to the public. These advisories are gathered in a publicly available database at the Secunia website: http://secunia.com/ Secunia offers services to our customers enabling them to receive all relevant vulnerability information to their specific system configuration. Secunia offers a FREE mailing list called Secunia Security Advisories: http://secunia.com/secunia_security_advisories/ ====================================================================== 9) Verification Please verify this advisory by visiting the Secunia website: http://secunia.com/secunia_research/2005-61/advisory/ Complete list of vulnerability reports published by Secunia Research: http://secunia.com/secunia_research/ ======================================================================