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Snort TCP SACK Option Handling Denial of Service
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Secunia Advisory:
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SA16786
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Release Date:
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2005-09-13
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Popularity:
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7,830 views
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Critical:
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Moderately critical
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Impact:
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DoS
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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: | Snort 2.4.x
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Description:
Alejandro Hernandez Hernandez has reported a vulnerability in Snort, which can be exploited by malicious people to cause a DoS (Denial of Service).
The vulnerability is caused due to a NULL pointer dereference error in the "PrintTcpOptions()" function located in snort-2.4.0/src/log.c. This can be exploited to cause Snort to crash via a TCP/IP packet containing a malformed TCP SACK option.
Successful exploitation requires that Snort is configured to run in verbose mode (using the switch -v).
The vulnerability has been reported in version 2.4.0. Prior versions may also be affected.
Solution:
The vulnerability has been fixed in the CVS repositories, and will be included in version 2.4.1.
Provided and/or discovered by:
Alejandro Hernandez Hernandez
Original Advisory:
Snort.org:
http://www.snort.org/pub-bin/snortnews.cgi#58
Vulnfact Research Group:
http://www.vulnfact.com/advisories/snort_adv.html
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About this Secunia Advisory
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Please note: The information that this Secunia Advisory is based on comes from a third party unless stated otherwise.
Secunia collects, validates, and verifies all vulnerability reports issued by security research groups, vendors, and others.
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