The utrace support in Linux kernel 2.6.18, and other versions, allows local users to cause a denial of service (system hang) related to "MT exec + utrace_attach spin failure mode," as demonstrated by ptrace-thrash.c.

The remote Oracle Linux 5 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2007-0347 advisory.

    [2.6.18-8.1.4.0.1.el5]
     -Fix bonding primary=ethX so it picks correct network (Bert Barbe) [IT      101532] [ORA 5136660]
     -Add entropy module option to e1000 (John Sobecki) [ORA 6045759]
     -Add entropy module option to bnx2 (John Sobecki) [ORA 6045759]

     [2.6.18.8.1.4.el5]
     - [ipv6] Fix routing regression. (David S. Miller ) [238046]
     - [mm] Gdb does not accurately output the backtrace. (Dave Anderson )      [235511]
     - [NMI] change watchdog timeout to 30 seconds (Larry Woodman ) [237655]
     - [dlm] fix mode munging (David Teigland ) [238731]
     - [net] kernel-headers: missing include of types.h (Neil Horman ) [238749]
     - [net] fib_semantics.c out of bounds check (Thomas Graf ) [238948]      {CVE-2007-2172}
     - [net] disallow RH0 by default (Thomas Graf ) [238949] {CVE-2007-2242}
     - [net] Fix user OOPS'able bug in FIB netlink (David S. Miller )      [238960] {CVE-2007-1861}
     - [net] IPv6 fragments bypass in nf_conntrack netfilter code (Thomas      Graf ) [238947] {CVE-2007-1497}
     - [net] ipv6_fl_socklist is inadvertently shared (David S. Miller )      [238944] {CVE-2007-1592}
     - [net] Various NULL pointer dereferences in netfilter code (Thomas Graf      ) [238946] {CVE-2007-1496}

     [2.6.18-8.1.3.el5]
     - [s390] page_mkclean causes data corruption on s390 (Jan Glauber ) [236605]

     [2.6.18-8.1.2.el5]
     - [utrace] exploit and unkillable cpu fixes (Roland McGrath ) [228816]      (CVE-2007-0771)
     - [net] IPV6 security holes in ipv6_sockglue.c - 2 (David S. Miller )      [232257] {CVE-2007-1000}
     - [net] IPV6 security holes in ipv6_sockglue.c (David S. Miller )      [232255] {CVE-2007-1388}
     - [audit] GFP_KERNEL allocations in non-blocking context fix (Alexander      Viro ) [233157]

     [2.6.18-8.1.1.el5]
     - [cpufreq] Remove __initdata from tscsync (Prarit Bhargava ) [229887]
     - [security] Fix key serial number collision problem (David Howells )      [229883] {CVE-2007-0006}
     - [fs] Don't core dump read-only binarys (Don Howard ) [229885]      {CVE-2007-0958}
     - [xen] Enable booting on machines with > 64G (Chris Lalancette) [230117]
     - Fix potential buffer overflow in cardman 4040 cmx driver (Don Howard)      [229884] {CVE-2007-0005}

Tenable has extracted the preceding description block directly from the Oracle Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Updated kernel packages that fix security issues and bugs in the Red Hat Enterprise Linux 5 kernel are now available.

This update has been rated as having important security impact by the Red Hat Security Response Team.

The Linux kernel handles the basic functions of the operating system.

These new kernel packages contain fixes for the following security issues :

* a flaw in the IPv6 socket option handling that allowed a local user to read arbitrary kernel memory (CVE-2007-1000, Important).

* a flaw in the IPv6 socket option handling that allowed a local user to cause a denial of service (CVE-2007-1388, Important).

* a flaw in the utrace support that allowed a local user to cause a denial of service (CVE-2007-0771, Important).

In addition to the security issues described above, a fix for a memory leak in the audit subsystem and a fix for a data corruption bug on s390 systems have been included.

Red Hat Enterprise Linux 5 users are advised to upgrade to these erratum packages, which are not vulnerable to these issues.

ID	Name	Product	Family	Severity
67495	Oracle Linux 5 : Important: / kernel (ELSA-2007-0347)	Nessus	Oracle Linux Local Security Checks	medium
25328	RHEL 5 : kernel (RHSA-2007:0169)	Nessus	Red Hat Local Security Checks	high
25126	CentOS 5 : Kernel (CESA-2007:0169)	Nessus	CentOS Local Security Checks	high

Detections

Analytics

CVE-2007-0771

medium

Tenable Plugins

medium

high

high