58264 : Snort Unified Output Plugin Stream5 Preprocessor Log Manipulation
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Views This Week	Views All Time	Added to OSVDB	Last Modified	Modified (since 2008)	Percent Complete
4	290	over 2 years ago	over 2 years ago	4 times	90%

Timeline

Discovery Date	Vendor Informed Date	Vendor Ack Date	Vendor Solution Date	Disclosure Date
2009-06-30	2009-07-20	2009-07-20	2009-09-16	2009-09-19

Time to Patch
58 days

Keywords

Unified1, stream5, log alert evasion, log alert falsification

Description

The file output-unified.c doesnt set the offset properly on a fwrite() operation, causing the unified headers to be overwritten by the network raw packet. The raw packet can be modified to look like a unified header structure, making possible to insert false alerts. Inserting a false alert with the field size greater than the limit specified at snort.conf will make a parser to stop reading the rest of the alerts in the log file.

Classification

Location: Remote / Network Access
Attack Type: Input Manipulation
Impact: Loss of Integrity
Solution: Upgrade
Exploit: Exploit Public
Disclosure: Vendor Verified
OSVDB: Security Software

Solution

Upgrade to version 2.8.5 or higher, as it has been reported to fix this vulnerability. An upgrade is required as there are no known workarounds.

Products

Sourcefire, Inc.	Snort	2.8.1
		2.8.2
		2.8.3
		2.8.4
		2.8.5 beta

References

Bugtraq ID: 36473
Secunia Advisory ID: 36808
Milw0rm: 9731
Exploit Database: 9731
Generic Exploit URL: http://milw0rm.com/sploits/2009-snort-unified1_bug.tar.gz
Other Advisory URL: http://pablo-secdev.blogspot.com/2009/09/snort-28-285stable-unified1-output-bug.html

Manual Testing Notes

Credit

Pablo Rincon Crespo - pablo.rincon.crespogmail.com -

CVSSv2 Score

We currently have no CVSS2 data on this vulnerability. Feel free to suggest it.

Blogs

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