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

SECUNIA ADVISORY ID:
SA17992

VERIFY ADVISORY:
http://secunia.com/advisories/17992/

CRITICAL:
Moderately critical

IMPACT:
System access

WHERE:
>From remote

SOFTWARE:
Pegasus Mail for 32-bit Windows Systems 4.x
http://secunia.com/product/5565/

DESCRIPTION:
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), and also affects version 4.21a and 4.21b.

SOLUTION:
Update to version 4.31.
http://www.pmail.com/downloads_de_t.htm

PROVIDED AND/OR DISCOVERED BY:
Tan Chew Keong, Secunia Research.

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

Secunia Research:
http://secunia.com/secunia_research/2005-61/advisory/

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About:
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