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Secunia Research 20/12/2005

- Pegasus Mail Buffer Overflow and Off-by-One Vulnerabilities -

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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

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1) Affected Software

* Pegasus Mail version 4.21a, 4.21b, and 4.21c.
* Pegasus Mail version 4.30PB1 (Public Beta 1).

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2) Severity

Rating: Moderately Critical
Impact: System access
Where: Remote

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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).

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4) Solution

Updated to version 4.31.

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5) Time Table

13/12/2005 - Initial vendor notification.
13/12/2005 - Initial vendor reply.
20/12/2005 - Public disclosure.

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6) Credits

Discovered by Tan Chew Keong, Secunia Research.

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7) References

Pegasus Mail:
http://www.pmail.com/newsflash.htm#secunia

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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/

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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/

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