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Exim HELO/EHLO Heap Overflow Vulnerability
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Secunia Advisory:
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SA9661
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Release Date:
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2003-09-03
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Last Update:
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2003-09-09
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Popularity:
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8,668 views
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Critical:
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Moderately critical
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Impact:
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DoS
System access
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Where:
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From remote
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Solution Status:
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Vendor Patch
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| Software: | Exim 3.x
Exim 4.x
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Subscribe:
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Instant alerts on relevant vulnerabilities 
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| CVE reference: | CVE-2003-0743
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Description:
A vulnerability has been identified in Exim, which potentially can be exploited by malicious people to cause a DoS (Denial of Service) on a vulnerable system or compromise it.
The vulnerability is caused due to a boundary error when handling input to the HELO and EHLO commands. This can be exploited to cause a heap overflow by supplying an argument containing 500 or more spaces followed by a NULL byte and CRLF (carriage return, line feed).
Successful exploitation might allow execution of arbitrary code on a vulnerable system. However, this has not been confirmed and the vulnerability is not currently thought to be exploitable.
Solution:
Update to version 4.21 or apply patches.
http://www.exim.org/mirrors.html
Patches for versions 4.20 and 3.36:
http://www.exim.org/pipermail/exim-users/Week-of-Mon-20030811/057720.html
Provided and/or discovered by:
Nick Cleaton
Original Advisory:
http://www.exim.org/pipermail/exim-users/Week-of-Mon-20030811/057720.html
http://www.exim.org/pipermail/exim-users/Week-of-Mon-20030811/057809.html
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Please note: The information that this Secunia Advisory is based on comes from a third party unless stated otherwise.
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