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Snort TCP reassembly heap overflow
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Secunia Advisory:
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SA8605
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Release Date:
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2003-04-16
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Last Update:
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2003-04-29
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Popularity:
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9,777 views
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Critical:
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Highly critical
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Impact:
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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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| OS: | Conectiva Linux 8
Gentoo Linux 1.x
Mandrake Linux 8.x
Mandrake Linux 9.x
Mandrake Multi Network Firewall 8.x
SmoothWall Express 2.0
SmoothWall GPL 1.x
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| Software: | Snort 1.8.x
Snort 1.9.x
Snort 2.0.x
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Subscribe:
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| CVE reference: | CVE-2003-0209
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Description:
A vulnerability was reported in Snort, which could be exploited by a malicious person to execute arbitrary code on the system running Snort.
The problem is that it is possible to overflow a 32 bit integer value by sending fragmented TCP packets with malicious sequence numbers. The heap overflow which is caused can reportedly be exploited to execute arbitrary code.
The vulnerability is in the stream4 preprocessor, which reassembles fragmented TCP streams.
Snort versions 1.8, 1.9 and Snort 2.0 prior to RC1 are vulnerable.
Solution:
Snort version 2.0 is not vulnerable.
http://www.snort.org/dl/
Furthermore, Snort should be configured to run as a low privileged user in a chrooted environment. This reduces the impact of a successfully exploited vulnerability giving system administrators more time to react if a system is compromised.
The affected vendors have not issued updates.
Other software may be affected as well.
Provided and/or discovered by:
Bruce Leidl, Juan Pablo Martinez Kuhn and Alejandro David Weil from Core Security Technologies.
Changelog:
2003-04-22: Added CVE reference.
Original Advisory:
http://www.coresecurity.com/common/showdoc.php?idx=313&idxseccion=10
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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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