Buffer overflow in NFS readlink handling in the Linux Kernel 2.4 up to 2.4.31 allows remote NFS servers to cause a denial of service (crash) via a long symlink, which is not properly handled in (1) nfs2xdr.c or (2) nfs3xdr.c and causes a crash in the NFS client.

This advisory covers the S/390 components of the recent security update for the Linux 2.6.8 kernel that were missing due to technical problems. For reference, please see the text of the original advisory.

  Several security related problems have been discovered in the Linux   kernel which may lead to a denial of service or even the execution   of arbitrary code. The Common Vulnerabilities and Exposures project   identifies the following problems :

    - CVE-2004-2660       Toshihiro Iwamoto discovered a memory leak in the       handling of direct I/O writes that allows local users       to cause a denial of service.

    - CVE-2005-4798       A buffer overflow in NFS readlink handling allows a       malicious remote server to cause a denial of service.

    - CVE-2006-1052       Stephen Smalley discovered a bug in the SELinux ptrace       handling that allows local users with ptrace       permissions to change the tracer SID to the SID of       another process.

    - CVE-2006-1343       Pavel Kankovsky discovered an information leak in the       getsockopt system call which can be exploited by a       local program to leak potentially sensitive memory to       userspace.

    - CVE-2006-1528       Douglas Gilbert reported a bug in the sg driver that       allows local users to cause a denial of service by       performing direct I/O transfers from the sg driver to       memory mapped I/O space.

    - CVE-2006-1855       Mattia Belletti noticed that certain debugging code       left in the process management code could be exploited       by a local attacker to cause a denial of service.

    - CVE-2006-1856       Kostik Belousov discovered a missing LSM       file_permission check in the readv and writev       functions which might allow attackers to bypass       intended access restrictions.

    - CVE-2006-2444       Patrick McHardy discovered a bug in the SNMP NAT       helper that allows remote attackers to cause a denial       of service.

    - CVE-2006-2446       A race condition in the socket buffer handling allows       remote attackers to cause a denial of service.

    - CVE-2006-2935       Diego Calleja Garcia discovered a buffer overflow in       the DVD handling code that could be exploited by a       specially crafted DVD USB storage device to execute       arbitrary code.

    - CVE-2006-2936       A bug in the serial USB driver has been discovered       that could be exploited by a custom made USB serial       adapter to consume arbitrary amounts of memory.

    - CVE-2006-3468       James McKenzie discovered a denial of service       vulnerability in the NFS driver. When exporting an       ext3 file system over NFS, a remote attacker could       exploit this to trigger a file system panic by sending       a specially crafted UDP packet.

    - CVE-2006-3745       Wei Wang discovered a bug in the SCTP implementation       that allows local users to cause a denial of service       and possibly gain root privileges.

    - CVE-2006-4093       Olof Johansson discovered that the kernel does not       disable the HID0 bit on PowerPC 970 processors which       could be exploited by a local attacker to cause a       denial of service.

    - CVE-2006-4145       A bug in the Universal Disk Format (UDF) filesystem       driver could be exploited by a local user to cause a       denial of service.

    - CVE-2006-4535       David Miller reported a problem with the fix for       CVE-2006-3745 that allows local users to crash the       system via an SCTP socket with a certain SO_LINGER       value.

The following matrix explains which kernel version for which architecture fixes the problem mentioned above :

                              stable (sarge)                 Source                       2.6.8-16sarge5                 Alpha architecture           2.6.8-16sarge5                 AMD64 architecture           2.6.8-16sarge5                 HP Precision architecture    2.6.8-6sarge5                  Intel IA-32 architecture     2.6.8-16sarge5                 Intel IA-64 architecture     2.6.8-14sarge5                 Motorola 680x0 architecture  2.6.8-4sarge5                  PowerPC architecture         2.6.8-12sarge5                 IBM S/390                    2.6.8-5sarge5                  Sun Sparc architecture       2.6.8-15sarge5                 FAI                          1.9.1sarge4

Several security related problems have been discovered in the Linux kernel which may lead to a denial of service or even the execution of arbitrary code. The Common Vulnerabilities and Exposures project identifies the following problems :

  - CVE-2005-4798     A buffer overflow in NFS readlink handling allows a     malicious remote server to cause a denial of service.

  - CVE-2006-2935     Diego Calleja Garcia discovered a buffer overflow in the     DVD handling code that could be exploited by a specially     crafted DVD USB storage device to execute arbitrary     code.

  - CVE-2006-1528     A bug in the SCSI driver allows a local user to cause a     denial of service.

  - CVE-2006-2444     Patrick McHardy discovered a bug in the SNMP NAT helper     that allows remote attackers to cause a denial of     service.

  - CVE-2006-2446     A race condition in the socket buffer handling allows     remote attackers to cause a denial of service.

  - CVE-2006-3745     Wei Wang discovered a bug in the SCTP implementation     that allows local users to cause a denial of service and     possibly gain root privileges.

  - CVE-2006-4535     David Miller reported a problem with the fix for     CVE-2006-3745 that allows local users to crash the     system via an SCTP socket with a certain SO_LINGER     value.

The following matrix explains which kernel version for which architecture fixes the problem mentioned above :

                              stable (sarge)                 Source                       2.4.27-10sarge4                Alpha architecture           2.4.27-10sarge4                ARM architecture             2.4.27-2sarge4                 Intel IA-32 architecture     2.4.27-10sarge4                Intel IA-64 architecture     2.4.27-10sarge4                Motorola 680x0 architecture  2.4.27-3sarge4                 MIPS architectures           2.4.27-10.sarge4.040815-1      PowerPC architecture         2.4.27-10sarge4                IBM S/390                    2.4.27-2sarge4                 Sun Sparc architecture       2.4.27-9sarge4                 FAI                          1.9.1sarge4                    mindi-kernel                 2.4.27-2sarge3                 kernel-image-speakup-i386    2.4.27-1.1sarge3               systemimager                 3.2.3-6sarge3

Updated kernel packages are now available as part of ongoing support and maintenance of Red Hat Enterprise Linux version 3. This is the seventh regular update.

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

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

This is the seventh regular kernel update to Red Hat Enterprise Linux 3.

New features introduced by this update include :

  - addition of the bnx2, dell_rbu, and megaraid_sas device     drivers - support for multi-core, multi-threaded Intel     Itanium processors - upgrade of the SATA subsystem to     include ATAPI and SMART support - optional tuning via     the new numa_memory_allocator, arp_announce, and     printk_ratelimit sysctls

There were many bug fixes in various parts of the kernel. The ongoing effort to resolve these problems has resulted in a marked improvement in the reliability and scalability of Red Hat Enterprise Linux 3.

There were numerous driver updates and security fixes (elaborated below). Other key areas affected by fixes in this update include the networking subsystem, the VM subsystem, NPTL handling, autofs4, the USB subsystem, CPU enumeration, and 32-bit-exec-mode handling on 64-bit architectures.

The following device drivers have been upgraded to new versions :

aacraid -------- 1.1.5-2412 bnx2 ----------- 1.4.30 (new) dell_rbu
------- 2.1 (new) e1000 ---------- 6.1.16-k3 emulex --------- 7.3.3 fusion --------- 2.06.16.02 ipmi ----------- 35.11 megaraid2 ------ v2.10.10.1 megaraid_sas --- 00.00.02.00 (new) tg3 ------------ 3.43RH

The following security bugs were fixed in this update :

  - a flaw in gzip/zlib handling internal to the kernel that     allowed a local user to cause a denial of service     (crash) (CVE-2005-2458,low)

  - a flaw in ext3 EA/ACL handling of attribute sharing that     allowed a local user to gain privileges (CVE-2005-2801,     moderate)

  - a minor info leak with the get_thread_area() syscall     that allowed a local user to view uninitialized kernel     stack data (CVE-2005-3276, low)

Note: The kernel-unsupported package contains various drivers and modules that are unsupported and therefore might contain security problems that have not been addressed.

All Red Hat Enterprise Linux 3 users are advised to upgrade their kernels to the packages associated with their machine architectures and configurations as listed in this erratum.

The remote CentOS system is missing a security update which has been documented in Red Hat advisory RHSA-2006-0144.

ID	Name	Product	Family	Severity
22726	Debian DSA-1184-2 : kernel-source-2.6.8 - several vulnerabilities	Nessus	Debian Local Security Checks	high
22725	Debian DSA-1183-1 : kernel-source-2.4.27 - several vulnerabilities	Nessus	Debian Local Security Checks	high
21882	CentOS 3 : kernel (CESA-2006:0144)	Nessus	CentOS Local Security Checks	medium
21089	RHEL 3 : kernel (RHSA-2006:0144)	Nessus	Red Hat Local Security Checks	medium
801416	CentOS RHSA-2006-0144 Security Check	Log Correlation Engine	Generic	high

Detections

Analytics

CVE-2005-4798

high

Tenable Plugins

high

high

medium

medium

high