Linux kernel tcp_find_option denial of service
| linux-tcpfindoption-dos (16554) |  Low Risk |
Description:
Linux kernel is vulnerable to a denial of service attack, caused by a vulnerability in the tcp_find_option function in the ip_tables.c file. A remote attacker could send a specially-crafted TCP packet to cause the kernel to consume all available CPU resources and enter into an infinite loop.
Consequences:
Denial of Service
Remedy:
For SuSE Linux:
Upgrade to the latest kernel package, as listed below. Refer to SuSE Security Announcement SUSE-SA:2004:020 for more information. See References.
SuSE Linux 9.1: 2.6.5-7.95 or later
SuSE Linux 9.0: 2.4.21-231 or later
SuSE Linux 8.2: 2.4.20-115 or later
SuSE Linux 8.1: 2.4.21-231 or later
SuSE Linux 8.0: 2.4.18-303 or later
For Gentoo Linux:
Upgrade to the latest version of kernel, as listed in GLSA 200407-12. See References.
For Conectiva Linux:
Upgrade to the latest kernel package, as listed below.Refer to Conectiva Linux Security Announcement CLSA-2004:852 for more information. See References.
Conectiva Linux 10.0: 2.6.5-63255U10_1cl or later
For other distributions:
Contact your vendor for upgrade or patch information.
References:
- BugTraq Mailing List, Wed Jun 30 2004 - 05:57:17 CDT: Remote DoS vulnerability in Linux kernel 2.6.x.
- Conectiva Linux Security Announcement CLSA-2004:852: Fixes for kernel vulnerabilities.
- BID-10634: Linux Kernel IPTables Sign Error Denial Of Service Vulnerability
- CVE-2004-0626: The tcp_find_option function of the netfilter subsystem in Linux kernel 2.6, when using iptables and TCP options rules, allows remote attackers to cause a denial of service (CPU consumption by infinite loop) via a large option length that produces a negative integer after a casting operation to the char type.
- GLSA-200407-12: Linux Kernel: Remote DoS vulnerability with IPTables TCP Handling
- SUSE-SA:2004:020: kernel: local privilege escalation
Platforms Affected:
- Conectiva Linux 10
- Gentoo Linux
- Linux Kernel 2.6.0
- Novell SuSE Linux Enterprise Server 7.0
- SuSE SuSE eMail Server III
- SUSE SuSE Linux 8.0
- SUSE SuSE Linux 8.1
- SUSE SuSE Linux 8.2
- SUSE SuSE Linux 9.0
- SUSE SuSE Linux 9.1
- SuSE SuSE Linux Connectivity Server
- SuSE SuSE Linux Database Server
- SuSE SuSE Linux Office Server
Reported:
Jun 30, 2004
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