[Snort-sigs] Sourcefire Advisory: Vulnerability in Snort DCE/RPC Preprocessor

Sourcefire VRT research at ...435...
Mon Feb 19 15:12:53 EST 2007


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February 19, 2007

Summary:

Sourcefire has learned of a remotely exploitable vulnerability in the
Snort DCE/RPC preprocessor. This preprocessor is vulnerable to a
stack-based buffer overflow that could potentially allow attackers to
execute code with the same privileges as the Snort binary. Sourcefire
has prepared updates for Snort open-source software to address this issue.

This vulnerability has been identified as CVE-2006-5276.


Snort Versions Affected:

* Snort 2.6.1, 2.6.1.1, and 2.6.1.2
* Snort 2.7.0 beta 1

This vulnerability also affects Sourcefire commercial products. For
information and updates for Sourcefire products, please go to the
Sourcefire support site.


Mitigating Factors:

Users who have disabled the DCE/RPC preprocessor are not vulnerable.
However, the DCE/RPC preprocessor is enabled by default.


Recommended Actions:

* Open-source Snort 2.6.1.x users are advised to upgrade to Snort
2.6.1.3 (or later) immediately.
* Open-source Snort 2.7 beta users are advised to mitigate this issue by
disabling the DCE/RPC preprocessor.
  This issue will be resolved in Snort 2.7 beta 2.


Workarounds:

Snort users who cannot upgrade immediately are advised to disable the
DCE/RPC preprocessor by removing the DCE/RPC preprocessor directives
from snort.conf and restarting Snort. However, be advised that disabling
the DCE/RPC preprocessor reduces detection capabilities for attacks in
DCE/RPC traffic. After upgrading, customers should reenable the DCE/RPC
preprocessor.


Detecting Attacks Against This Vulnerability:

Sourcefire will be releasing a rule pack that provides detection for
attacks against this vulnerability.


FAQs:

What does the update do?
- - Snort 2.6.1.3 (or later) removes the vulnerability by correcting the
buffer overflow condition in the DCE/RPC preprocessor.

Has Sourcefire received any reports that this vulnerability has been
exploited?
- - No. Sourcefire has not received any reports that this vulnerability
has been exploited.


Acknowledgments:

Sourcefire would like to thank Neel Mehta from IBM X-Force for reporting
this issue and working with us to resolve it.
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