32094 : Snort DCE/RPC Pre-Processor Packet Reassembly Remote Overflow
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Info

Last Modified
about 1 year ago

Percent Complete
100%

Disclosure
Feb 17, 2007

Discovery
Unknown

Dates

Exploit
Feb 23, 2007

Solution
Unknown

Keywords

 No Keywords

Description

 A remote overflow exists in Snort. The DCE/RPC Pre-Processor fails to check if traffic is part of a valid TCP session, and multiple "Write AndX" requests can be chained in the same TCP segment resulting in a stack overflow. With a specially crafted SMB packet, an attacker can cause arbitrary code execution resulting in a loss of integrity.

Classification

 Location: Remote/Network Access Required
Attack Type: Input Manipulation
Impact: Loss of Integrity
Exploit: Exploit Available
Disclosure: OSVDB Verified

Technical

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

Solution

 Upgrade to version 2.6.1.3 or higher, as it has been reported to fix this vulnerability. It is also possible to correct the flaw by implementing the following workaround:
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.

Products
Sourcefire, Inc.
Watch-list
Snort
Watch-list
 2.6.1.2
2.6.1.1
2.6.1.0
2.7.0 beta 1
2.6.1.3
Nortel Networks
Watch-list
Threat Protection System Intrusion Sensor
Watch-list
 4.1
4.6
4.5
Threat Protection System Defense Center
Watch-list
 4.1
4.6
4.5

References

Tools & Filters

Snort

 10158 10159 10160

Nessus

 24686 24749 27749

Credit
  • Neel Mehta - Internet Security Systems

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