Updated kernel packages that fix several security issues in the Red Hat Enterprise Linux 4 kernel are now available.

This security advisory 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 security issues described below :

* a flaw in the get_fdb_entries function of the network bridging support that allowed a local user to cause a denial of service (crash) or allow a potential privilege escalation (CVE-2006-5751, Important)

* an information leak in the _block_prepare_write function that allowed a local user to read kernel memory (CVE-2006-4813, Important)

* an information leak in the copy_from_user() implementation on s390 and s390x platforms that allowed a local user to read kernel memory (CVE-2006-5174, Important)

* a flaw in the handling of /proc/net/ip6_flowlabel that allowed a local user to cause a denial of service (infinite loop) (CVE-2006-5619, Important)

* a flaw in the AIO handling that allowed a local user to cause a denial of service (panic) (CVE-2006-5754, Important)

* a race condition in the mincore system core that allowed a local user to cause a denial of service (system hang) (CVE-2006-4814, Moderate)

* a flaw in the ELF handling on ia64 and sparc architectures which triggered a cross-region memory mapping and allowed a local user to cause a denial of service (CVE-2006-4538, Moderate)

* a flaw in the dev_queue_xmit function of the network subsystem that allowed a local user to cause a denial of service (data corruption) (CVE-2006-6535, Moderate)

* a flaw in the handling of CAPI messages over Bluetooth that allowed a remote system to cause a denial of service or potential code execution. This flaw is only exploitable if a privileged user establishes a connection to a malicious remote device (CVE-2006-6106, Moderate)

* a flaw in the listxattr system call that allowed a local user to cause a denial of service (data corruption) or potential privilege escalation. To successfully exploit this flaw the existence of a bad inode is required first (CVE-2006-5753, Moderate)

* a flaw in the __find_get_block_slow function that allowed a local privileged user to cause a denial of service (CVE-2006-5757, Low)

* various flaws in the supported filesystems that allowed a local privileged user to cause a denial of service (CVE-2006-5823, CVE-2006-6053, CVE-2006-6054, CVE-2006-6056, Low)

In addition to the security issues described above, fixes for the following bugs were included :

* initialization error of the tg3 driver with some BCM5703x network card

* a memory leak in the audit subsystem

* x86_64 nmi watchdog timeout is too short

* ext2/3 directory reads fail intermittently

Red Hat would like to thank Dmitriy Monakhov and Kostantin Khorenko for reporting issues fixed in this erratum.

All Red Hat Enterprise Linux 4 users are advised to upgrade their kernels to the packages associated with their machine architecture and configurations as listed in this erratum.

From Red Hat Security Advisory 2007:0014 :

Updated kernel packages that fix several security issues in the Red Hat Enterprise Linux 4 kernel are now available.

This security advisory 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 security issues described below :

* a flaw in the get_fdb_entries function of the network bridging support that allowed a local user to cause a denial of service (crash) or allow a potential privilege escalation (CVE-2006-5751, Important)

* an information leak in the _block_prepare_write function that allowed a local user to read kernel memory (CVE-2006-4813, Important)

* an information leak in the copy_from_user() implementation on s390 and s390x platforms that allowed a local user to read kernel memory (CVE-2006-5174, Important)

* a flaw in the handling of /proc/net/ip6_flowlabel that allowed a local user to cause a denial of service (infinite loop) (CVE-2006-5619, Important)

* a flaw in the AIO handling that allowed a local user to cause a denial of service (panic) (CVE-2006-5754, Important)

* a race condition in the mincore system core that allowed a local user to cause a denial of service (system hang) (CVE-2006-4814, Moderate)

* a flaw in the ELF handling on ia64 and sparc architectures which triggered a cross-region memory mapping and allowed a local user to cause a denial of service (CVE-2006-4538, Moderate)

* a flaw in the dev_queue_xmit function of the network subsystem that allowed a local user to cause a denial of service (data corruption) (CVE-2006-6535, Moderate)

* a flaw in the handling of CAPI messages over Bluetooth that allowed a remote system to cause a denial of service or potential code execution. This flaw is only exploitable if a privileged user establishes a connection to a malicious remote device (CVE-2006-6106, Moderate)

* a flaw in the listxattr system call that allowed a local user to cause a denial of service (data corruption) or potential privilege escalation. To successfully exploit this flaw the existence of a bad inode is required first (CVE-2006-5753, Moderate)

* a flaw in the __find_get_block_slow function that allowed a local privileged user to cause a denial of service (CVE-2006-5757, Low)

* various flaws in the supported filesystems that allowed a local privileged user to cause a denial of service (CVE-2006-5823, CVE-2006-6053, CVE-2006-6054, CVE-2006-6056, Low)

In addition to the security issues described above, fixes for the following bugs were included :

* initialization error of the tg3 driver with some BCM5703x network card

* a memory leak in the audit subsystem

* x86_64 nmi watchdog timeout is too short

* ext2/3 directory reads fail intermittently

Red Hat would like to thank Dmitriy Monakhov and Kostantin Khorenko for reporting issues fixed in this erratum.

All Red Hat Enterprise Linux 4 users are advised to upgrade their kernels to the packages associated with their machine architecture and configurations as listed in this erratum.

CVE-2006-6060 CVE-2006-6106 CVE-2006-6535 CVE-2007-0958 CVE-2007-1357  CVE-2007-1592

Several local and remote vulnerabilities have been discovered in the Linux kernel that may lead to a denial of service or the execution of arbitrary code. 

This update also fixes a regression in the smbfs subsystem which was introduced in DSA-1233which caused symlinks to be interpreted as regular files.

The Common Vulnerabilities and Exposures project identifies the following problems :

  - CVE-2005-4811     David Gibson reported an issue in the hugepage code     which could permit a local DoS (system crash) on     appropriately configured systems.

  - CVE-2006-4814     Doug Chapman discovered a potential local DoS (deadlock)     in the mincore function caused by improper lock     handling.

  - CVE-2006-4623     Ang Way Chuang reported a remote DoS (crash) in the dvb     driver which can be triggered by a ULE package with an     SNDU length of 0.

  - CVE-2006-5753     Eric Sandeen provided a fix for a local memory     corruption vulnerability resulting from a     misinterpretation of return values when operating on     inodes which have been marked bad.

  - CVE-2006-5754     Darrick Wong discovered a local DoS (crash)     vulnerability resulting from the incorrect     initialization of 'nr_pages' in aio_setup_ring().

  - CVE-2006-5757     LMH reported a potential local DoS which could be     exploited by a malicious user with the privileges to     mount and read a corrupted iso9660 filesystem.

  - CVE-2006-6053     LMH reported a potential local DoS which could be     exploited by a malicious user with the privileges to     mount and read a corrupted ext3 filesystem.

  - CVE-2006-6056     LMH reported a potential local DoS which could be     exploited by a malicious user with the privileges to     mount and read a corrupted hfs filesystem on systems     with SELinux hooks enabled (Debian does not enable     SELinux by default).

  - CVE-2006-6060     LMH reported a potential local DoS (infinite loop) which     could be exploited by a malicious user with the     privileges to mount and read a corrupted NTFS     filesystem.

  - CVE-2006-6106     Marcel Holtman discovered multiple buffer overflows in     the Bluetooth subsystem which can be used to trigger a     remote DoS (crash) and potentially execute arbitrary     code.

  - CVE-2006-6535     Kostantin Khorenko discovered an invalid error path in     dev_queue_xmit() which could be exploited by a local     user to cause data corruption.

  - CVE-2007-0958     Santosh Eraniose reported a vulnerability that allows     local users to read otherwise unreadable files by     triggering a core dump while using PT_INTERP. This is     related to CVE-2004-1073.

  - CVE-2007-1357     Jean Delvare reported a vulnerability in the appletalk     subsystem. Systems with the appletalk module loaded can     be triggered to crash by other systems on the local     network via a malformed frame.

  - CVE-2007-1592     Masayuki Nakagawa discovered that flow labels were     inadvertently being shared between listening sockets and     child sockets. This defect can be exploited by local     users to cause a DoS (Oops).

The remote CentOS system is missing a security update which has been documented in Red Hat advisory RHSA-2007-0014.

ID	Name	Product	Family	Published	Updated	Severity
24315	RHEL 4 : kernel (RHSA-2007:0014)	Nessus	Red Hat Local Security Checks	2/9/2007	1/14/2021	high
67438	Oracle Linux 4 : kernel (ELSA-2007-0014)	Nessus	Oracle Linux Local Security Checks	7/12/2013	8/24/2021	high
36838	CentOS 4 : kernel (CESA-2007:0014)	Nessus	CentOS Local Security Checks	4/23/2009	1/4/2021	high
25529	Debian DSA-1304-1 : kernel-source-2.6.8 - several vulnerabilities	Nessus	Debian Local Security Checks	6/18/2007	1/4/2021	high
801424	CentOS RHSA-2007-0014 Security Check	Log Correlation Engine	Generic			high

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