Snort fragmented RPC preprocessor buffer overflow

snort-rpc-fragment-bo (10956) The risk level is classified as HighHigh Risk

Description:

Snort is vulnerable to a buffer overflow in the Remote Procedure Call (RPC) preprocessor. By sending fragmented RPC traffic to any host monitored by the Snort intrusion detection system, a remote attacker could overflow a buffer and cause the Snort sensor to crash, or execute arbitrary code on the system with the privileges of the Snort IDS process.


Consequences:

Gain Access

Remedy:

For Virtual Patch:

Enable the following checks in the ISS Protection Platform:
RPC_Large_Fragmented

For Manual Protection:

Upgrade to the latest version of Snort (1.9.1 or later), available from the Snort.org Web site. See References.

For Gentoo Linux:
Upgrade to the latest version of snort (2.0.0 or later), as listed in Gentoo Linux Security Announcement 200304-06. See References.

For EnGarde Secure Linux Community Edition:
Upgrade to the latest snort package (1.9.1-1.0.9 or later), as listed in EnGarde Secure Linux Security Advisory ESA-20030307-007. See References.

For Mandrake Linux 8.2 and 9.0, Corporate Server 2.1, and Multi Network Firewall 8.2:
Upgrade to the latest snort package (1.9.1-0.5mdk), as listed in MandrakeSoft Security Advisory MDKSA-2003:029:snort. See References.

For Linux SmoothWall Firewall GPL 1.0:
Upgrade to the latest snort package (fixes2 or later) as listed on the SmoothWall Web site. See References.

For SmoothWall version GPL 1.0:
Apply the fixes2 patch, available from the SmoothWall.org Web site. See References.

For SmoothWall version GPL 2.0 beta4 "mallard":
Apply the fixes1 patch, available from the SmoothWall.org Web site. See References.

As a workaround, Snort users may disable the RPC preprocessor. However, this workaround will disable all RPC-based detection. The vulnerable preprocessor can be disabled by commenting out the following line within the "snort.conf" configuration file:

#preprocessor rpc_decode: 111 32771

For Debian GNU/Linux 3.0 (alias woody):
Upgrade to the latest snort package (1.8.4beta1-3.1 or later), as listed in DSA 297-1. See References.

For other distributions:
Contact your vendor for upgrade or patch information.

References:

Platforms Affected:

  • Debian Debian Linux 3.0
  • EngardeLinux Secure Linux
  • EngardeLinux Secure Professional
  • Gentoo Linux
  • MandrakeSoft Mandrake Linux 8.2 PPC
  • MandrakeSoft Mandrake Linux 8.2
  • MandrakeSoft Mandrake Linux 9.0
  • MandrakeSoft Mandrake Linux Corporate Server 2.1
  • MandrakeSoft Mandrake Multi Network Firewall 8.2
  • SmoothWall SmoothWall 1.0
  • SmoothWall SmoothWall 2.0 beta4
  • Snort Snort 1.8.0
  • Snort Snort 1.8.1
  • Snort Snort 1.8.2
  • Snort Snort 1.8.3
  • Snort Snort 1.8.4
  • Snort Snort 1.8.5
  • Snort Snort 1.8.6
  • Snort Snort 1.8.7
  • Snort Snort 1.9.0

Reported:

Mar 03, 2003

The information within this database may change without notice. Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. In no event shall the author/distributor (IBM Internet Security Systems X-Force) be held liable for any damages whatsoever arising out of or in connection with the use or spread of this information.

For corrections or additions please email ignore thisxforceignore this@ignore thisus.ignore thisibm.comignore this

Return to the main page