Snort mailing list archives
RE: [Snort-2003-001] Buffer overflow in Snort RPC p reprocessor
From: "Slighter, Tim" <tslighter () itc nrcs usda gov>
Date: Mon, 3 Mar 2003 13:12:04 -0700
Should it - or could it be specified that users running snort on a stealth interface would not be impacted? -----Original Message----- From: Martin Roesch [mailto:roesch () sourcefire com] Sent: Monday, March 03, 2003 11:00 AM Subject: [Snort-users] [Snort-2003-001] Buffer overflow in Snort RPC preprocessor -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Snort Vulnerability Advisory [SNORT-2003-001] Date: 2003-03-03 Affected Snort Versions: Any version starting with version 1.8 to those before 2003-03-03 1PM/ US/Eastern including 1.9.0 and CVS HEAD (Snort 2.0beta) Synopsis: A buffer overflow has been found in the snort RPC normalization routines by ISS X-Force. This can cause snort to execute arbitrary code embedded within sniffed network packets. This preprocessor is enabled by default. Snort 1.9.1 has been released to resolve this issue. For users using CVS HEAD, a fix has been committed to the source tree. Mitigation: If you are in an environment that can not upgrade snort immediately, comment out the line in your snort.conf that begins: preprocessor rpc_decode and replace it with # preprocessor rpc_decode Details: When the rpc decoder normalizes fragmented RPC records, it incorrectly checks the lengths of what is being normalized against the current packet size. The rpc decoder in Snort 1.9.1 and above contains new alert options that can be used to help detect this attack Option Default State alert_fragments INACTIVE alert_large_fragments ACTIVE alert_incomplete ACTIVE alert_multiple_requests ACTIVE The first option will alert on any rpc fragmented record it finds. Large fragments will alert when the reassembled fragment record will exceed the current packet length. The incomplete record will alert when there is a partial record found. The alert_multiple_requests will alert when we find more than one RPC request per packet ( or reassembled packet ). Download Locations: Sourcefire has acquired additional bandwidth and hosting to aid users wishing to upgrade their Snort implementation. Binaries are currently not available, this is a source release only at this time. As new binaries become available they will be added to the site. Source code: http://www.snort.org/dl/snort-1.9.1.tar.gz GPG Signatures: http://www.snort.org/dl/snort-1.9.1.tar.gz.asc CVS HEAD (Snort 2.0beta) has been fixed as well. - -- Martin Roesch - Founder/CTO, Sourcefire Inc. - (410)290-1616 Sourcefire: Snort-based Enterprise Intrusion Detection Infrastructure roesch () sourcefire com - http://www.sourcefire.com Snort: Open Source Network IDS - http://www.snort.org -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.0.7 (Darwin) iD8DBQE+Y5gfqj0FAQQ3KOARAkENAJ0Zf0tGT/BilYA32bIuQF0Te/A2bgCfWRu2 OoXy1dQb8B/1/AEbTDqjxSA= =NQ8d -----END PGP SIGNATURE----- ------------------------------------------------------- This sf.net email is sponsored by:ThinkGeek Welcome to geek heaven. http://thinkgeek.com/sf _______________________________________________ Snort-users mailing list Snort-users () lists sourceforge net Go to this URL to change user options or unsubscribe: https://lists.sourceforge.net/lists/listinfo/snort-users Snort-users list archive: http://www.geocrawler.com/redir-sf.php3?list=snort-users ------------------------------------------------------- This sf.net email is sponsored by:ThinkGeek Welcome to geek heaven. http://thinkgeek.com/sf _______________________________________________ Snort-users mailing list Snort-users () lists sourceforge net Go to this URL to change user options or unsubscribe: https://lists.sourceforge.net/lists/listinfo/snort-users Snort-users list archive: http://www.geocrawler.com/redir-sf.php3?list=snort-users
Current thread:
- RE: [Snort-2003-001] Buffer overflow in Snort RPC p reprocessor Slighter, Tim (Mar 03)
- Re: [Snort-2003-001] Buffer overflow in Snort RPC p reprocessor Martin Roesch (Mar 03)
- Re: [Snort-2003-001] Buffer overflow in Snort RPC p reprocessor Michael Anderson (Mar 03)
- Re: [Snort-2003-001] Buffer overflow in Snort RPC p reprocessor Bennett Todd (Mar 03)