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Snort Information for VU#139129
Vendor Statement-----BEGIN PGP SIGNED MESSAGE-----Hash: SHA1 Snort(TM) Advisory: Integer Overflow in Stream4 Date: April 16, 2003 Affected Versions: All versions of the following products are affected: * Snort 1.8 through 1.9.1 * Snort CVS - current branch up to version 2.0.0 beta Synopsis: The Sourcefire Vulnerability Research Team has learned of an integer overflow in the Snort stream4 preprocessor used by the Sourcefire Network Sensor product line. The Snort stream4 preprocessor (spp_stream4) incorrectly calculates segment size parameters during stream reassembly for certain sequence number ranges which can lead to an integer overflow that can be expanded to a heap overflow. The Snort stream4 flaw may lead to a denial of service (DoS) attack or remote command execution on a host running Snort. This attack can be launched by crafting TCP stream packets and transmitting them over a network segment that is being monitored by a vulnerable Snort implementation. In its default configuration, certain versions of snort are vulnerable to this attack, as is the default configuration of the Snort IDS. Disabling the stream4 preprocessor will make the snort invulnerable to the attack. To disable the stream4 preprocessor, edit snort.conf and replace any lines that begin with "preprocessor stream4" with "# preprocessor stream4" NOTE: Disabling the stream4 preprocessor disables stateful inspection and stream reassembly and could allow someone to evade snort using tcp stream segmentation attacks. Patches: Snort 2.0 has been released and corrects this vulnerability. (C) 2003 Sourcefire, Inc. All rights reserved. Sourcefire and Snort are trademarks or registered trademarks of Sourcefire, INC. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.1 (GNU/Linux) iD8DBQE+nadjavJ5BgQ0p28RAi8FAKCviv78UU8V2k+smfZU875Lcrhb9gCfQIXK CuzzM4EKTvbvkvo+wL47YYM= =u1yD -----END PGP SIGNATURE----- Vendor InformationThe vendor has not provided us with any further information regarding this vulnerability.AddendumSnort has released version 2.0 to address this vulnerability. This version is available at
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