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security advisorygentoobuffer overflow

Gentoo: 200304-06 Critical Advisory on Snort Buffer Overflow and DoS

The Snort stream4 preprocessor (spp_stream4) incorrectlycalculates segment size parameters during stream reassembly for certainsequence number ranges which can lead to an integer overflow that can beexpanded to a heap overflow.. - - --------------------------------------------------------------------- GENTOO LINUX SECURITY ANNOUNCEMENT 200304-06 - - --------------------------------------------------------------------- PACKAGE : snort SUMMARY : Multiple Vulnerabilities in Snort Preprocessors DATE : 2003-04-28 07:07 UTC EXPLOIT : remote VERSIONS AFFECTED : =snort-2.0.0 CVE : CAN-2003-0209 CAN-2003-0033 - - --------------------------------------------------------------------- New (and correct) ID and updated CVE link. - From advisories: "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." "Remote attackers may exploit the buffer overflow condition to run arbitrary code on a Snort sensor with the privileges of the Snort IDS process, which typically runs as the superuser. The vulnerable preprocessor is enabled by default. It is not necessary to establish an actual connection to a RPC portmapper service to exploit this vulnerability." Read the full advisories at: ;idxseccion=10 SOLUTION Itis recommended that all Gentoo Linux users who are running net-analyzer/snort upgrade to snort-2.0.0 as follows: emerge sync emerge snort emerge clean . Gentoo Linux alerts users to significant security flaws in Snort's Stream4 preprocessor, applicable to all releases before 2.9.18, recommending urgent updates to avert potential threats.. Snort Vulnerabilities, Gentoo Security Update, Stream4 Preprocessor Exploit. . Severity: Critical. LinuxSecurity.com Team

Apr 28, 2003 •Critical Gentoo