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Pegasus Mail Buffer Overflow and Off-by-One (POP3 reply, Email header)
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SUMMARY
" <http://www.pmail.com/> Pegasus Mail is a free, standards-based
electronic mail client suitable for use by single or multiple users on
single computers or on local area networks."
A buffer overflow and a off by one vulnerabilities in Pegasus Mail allow
remote attackers to cause the product to execute arbitrary code.
DETAILS
Vulnerable Systems:
* Pegasus Mail version 4.21a, 4.21b, and 4.21c.
* Pegasus Mail version 4.30PB1 (Public Beta 1).
Immune Systems:
* Pegasus Mail version 4.31
Buffer Overflow:
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.
Off by one:
An off-by-one error exists when displaying the
<http://www.faqs.org/rfcs/rfc2822.html> 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.
Disclosure Timeline:
13/12/2005 - Initial vendor notification.
13/12/2005 - Initial vendor reply.
20/12/2005 - Public disclosure.
ADDITIONAL INFORMATION
The information has been provided by <mailto:vuln@secunia.com> Secunia
Research.
The original article can be found at:
<http://secunia.com/advisories/17992/>
http://secunia.com/advisories/17992/
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