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TITLE:
eXtremail Multiple Vulnerabilities

SECUNIA ADVISORY ID:
SA27220

VERIFY ADVISORY:
http://secunia.com/advisories/27220/

CRITICAL:
Highly critical

IMPACT:
DoS, System access

WHERE:
>From remote

REVISION:
1.2 originally posted 2007-10-16

SOFTWARE:
eXtremail 2.x
http://secunia.com/product/12602/

DESCRIPTION:
mu-b has reported multiple vulnerabilities in eXtremail, which can be
exploited by malicious people to cause a DoS (Denial of Service) or to
potentially compromise a vulnerable system.

1) An integer underflow error exists within the processing of the
POP3 "USER" command. This can be exploited to crash an affected
server or potentially execute arbitrary code.

2) A boundary error exists within the processing of "LOGIN" commands
sent to the administrative interface. This can be exploited to cause
a stack-based buffer overflow by sending an overly long parameter
with the affected command.

3) A boundary error exists within the processing of CRAM-MD5
authentication messages. This can be exploited to cause a heap-based
buffer overflow.

4) A boundary error exists within the processing of the IMAP
"AUTHENTICATE PLAIN" command. This can be exploited to cause a
stack-based buffer overflow.

5) A boundary error exists within the processing of network packets.
This can be exploited to cause a heap-based buffer overflow by
sending specially crafted packets containing zero bytes to the IMAP
port.

Successful exploitation of these vulnerabilities may allow execution
of arbitrary code.

The vulnerabilities are reported in version 2.1.1. Other versions may
also be affected.

SOLUTION:
Restrict network access to the affected server.

PROVIDED AND/OR DISCOVERED BY:
mu-b

CHANGELOG:
2007-10-16: Added CVE reference.

ORIGINAL ADVISORY:
http://lists.grok.org.uk/pipermail/full-disclosure/2007-October/066677.html

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