Al Viro discovered a race condition in the /proc file handler of network devices. A local attacker could exploit this by opening any file in /proc/sys/net/ipv4/conf/<interface>/ and waiting until that interface was shut down. Under certain circumstances this could lead to a kernel crash or even arbitrary code execution with full kernel privileges. (CVE-2005-2709)

Tetsuo Handa discovered a local Denial of Service vulnerability in the udp_v6_get_port() function. On computers which use IPv6, a local attacker could exploit this to trigger an infinite loop in the kernel.
(CVE-2005-2973)

Harald Welte discovered a Denial of Service vulnerability in the USB devio driver. A local attacker could exploit this by sending an 'USB Request Block' (URB) and terminating the sending process before the arrival of the answer, which left an invalid pointer and caused a kernel crash. (CVE-2005-3055)

Pavel Roskin discovered an information leak in the Orinoco wireless card driver. When increasing the buffer length for storing data, the buffer was not padded with zeros, which exposed a random part of the system memory to the user. (CVE-2005-3180)

A resource leak has been discovered in the handling of POSIX timers in the exec() function. This could be exploited to a Denial of Service attack by a group of local users. This vulnerability only affects Ubuntu 4.10. (CVE-2005-3271)

Stephen Hemming discovered a weakness in the network bridge driver.
Packets which had already been dropped by the packet filter could poison the forwarding table, which could be exploited to make the bridge forward spoofed packages. This vulnerability only affects Ubuntu 4.10 and 5.04. (CVE-2005-3272)

David S. Miller discovered a buffer overflow in the rose_rt_ioctl() function. By calling the function with a large 'ngidis' argument, a local attacker could cause a kernel crash. This vulnerability only affects Ubuntu 4.10 and 5.04. (CVE-2005-3273)

Neil Horman discovered a race condition in the connection timer handling. This allowed a local attacker to set up an expiration handler which modified the connection list while the list still being traversed, which could result in a kernel crash. This vulnerability only affects multiprocessor (SMP) systems. (CVE-2005-3274)

Patrick McHardy noticed a logic error in the network address translation (NAT) connection tracker. A remote attacker could exploit this by causing two packets for the same protocol to be NATed at the same time, which resulted in a kernel crash. (CVE-2005-3275)

Paolo Giarrusso discovered an information leak in the sys_get_thread_area(). The returned structure was not properly cleared, which exposed a small amount of kernel memory to userspace programs. This could possibly expose confidential data.
(CVE-2005-3276).

Note that Tenable Network Security has extracted the preceding description block directly from the Ubuntu security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

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 IPv6 implementation that allowed a local user to cause a denial of service (infinite loop and crash) (CVE-2005-2973, important)

* a flaw in the bridge implementation that allowed a remote user to cause forwarding of spoofed packets via poisoning of the forwarding table with already dropped frames (CVE-2005-3272, moderate)

* a flaw in the atm module that allowed a local user to cause a denial of service (panic) via certain socket calls (CVE-2005-3359, important)

* a flaw in the NFS client implementation that allowed a local user to cause a denial of service (panic) via O_DIRECT writes (CVE-2006-0555, important)

* a difference in 'sysretq' operation of EM64T (as opposed to Opteron) processors that allowed a local user to cause a denial of service (crash) upon return from certain system calls (CVE-2006-0741 and CVE-2006-0744, important)

* a flaw in the keyring implementation that allowed a local user to cause a denial of service (OOPS) (CVE-2006-1522, important)

* a flaw in IP routing implementation that allowed a local user to cause a denial of service (panic) via a request for a route for a multicast IP (CVE-2006-1525, important)

* a flaw in the SCTP-netfilter implementation that allowed a remote user to cause a denial of service (infinite loop) (CVE-2006-1527, important)

* a flaw in the sg driver that allowed a local user to cause a denial of service (crash) via a dio transfer to memory mapped (mmap) IO space (CVE-2006-1528, important)

* a flaw in the threading implementation that allowed a local user to cause a denial of service (panic) (CVE-2006-1855, important)

* two missing LSM hooks that allowed a local user to bypass the LSM by using readv() or writev() (CVE-2006-1856, moderate)

* a flaw in the virtual memory implementation that allowed local user to cause a denial of service (panic) by using the lsof command (CVE-2006-1862, important)

* a directory traversal vulnerability in smbfs that allowed a local user to escape chroot restrictions for an SMB-mounted filesystem via '..\\' sequences (CVE-2006-1864, moderate)

* a flaw in the ECNE chunk handling of SCTP that allowed a remote user to cause a denial of service (panic) (CVE-2006-2271, moderate)

* a flaw in the handling of COOKIE_ECHO and HEARTBEAT control chunks of SCTP that allowed a remote user to cause a denial of service (panic) (CVE-2006-2272, moderate)

* a flaw in the handling of DATA fragments of SCTP that allowed a remote user to cause a denial of service (infinite recursion and crash) (CVE-2006-2274, moderate)

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

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. The Common Vulnerabilities and Exposures project identifies the following problems :

  - CVE-2004-2302     A race condition in the sysfs filesystem allows local     users to read kernel memory and cause a denial of     service (crash).

  - CVE-2005-0756     Alexander Nyberg discovered that the ptrace() system     call does not properly verify addresses on the amd64     architecture which can be exploited by a local attacker     to crash the kernel.

  - CVE-2005-0757     A problem in the offset handling in the xattr file     system code for ext3 has been discovered that may allow     users on 64-bit systems that have access to an ext3     filesystem with extended attributes to cause the kernel     to crash.

  - CVE-2005-1265     Chris Wright discovered that the mmap() function could     create illegal memory maps that could be exploited by a     local user to crash the kernel or potentially execute     arbitrary code.

  - CVE-2005-1761     A vulnerability on the IA-64 architecture can lead local     attackers to overwrite kernel memory and crash the     kernel.

  - CVE-2005-1762     A vulnerability has been discovered in the ptrace()     system call on the amd64 architecture that allows a     local attacker to cause the kernel to crash.

  - CVE-2005-1763     A buffer overflow in the ptrace system call for 64-bit     architectures allows local users to write bytes into     arbitrary kernel memory.

  - CVE-2005-1765     Zou Nan Hai has discovered that a local user could cause     the kernel to hang on the amd64 architecture after     invoking syscall() with specially crafted arguments.

  - CVE-2005-1767     A vulnerability has been discovered in the stack segment     fault handler that could allow a local attacker to cause     a stack exception that will lead the kernel to crash     under certain circumstances.

  - CVE-2005-2456     Balazs Scheidler discovered that a local attacker could     call setsockopt() with an invalid xfrm_user policy     message which would cause the kernel to write beyond the     boundaries of an array and crash.

  - CVE-2005-2458     Vladimir Volovich discovered a bug in the zlib routines     which are also present in the Linux kernel and allows     remote attackers to crash the kernel.

  - CVE-2005-2459     Another vulnerability has been discovered in the zlib     routines which are also present in the Linux kernel and     allows remote attackers to crash the kernel.

  - CVE-2005-2548     Peter Sandstrom noticed that snmpwalk from a remote host     could cause a denial of service (kernel oops from null     dereference) via certain UDP packets that lead to a     function call with the wrong argument.

  - CVE-2005-2801     Andreas Gruenbacher discovered a bug in the ext2 and     ext3 file systems. When data areas are to be shared     among two inodes not all information were compared for     equality, which could expose wrong ACLs for files.

  - CVE-2005-2872     Chad Walstrom discovered that the ipt_recent kernel     module on 64-bit processors such as AMD64 allows remote     attackers to cause a denial of service (kernel panic)     via certain attacks such as SSH brute force.

  - CVE-2005-3105     The mprotect code on Itanium IA-64 Montecito processors     does not properly maintain cache coherency as required     by the architecture, which allows local users to cause a     denial of service and possibly corrupt data by modifying     PTE protections.

  - CVE-2005-3106     A race condition in the thread management may allow     local users to cause a denial of service (deadlock) when     threads are sharing memory and waiting for a thread that     has just performed an exec.

  - CVE-2005-3107     When one thread is tracing another thread that shares     the same memory map a local user could cause a denial of     service (deadlock) by forcing a core dump when the     traced thread is in the TASK_TRACED state.

  - CVE-2005-3108     A bug in the ioremap() system call has been discovered     on the amd64 architecture that could allow local users     to cause a denial of service or an information leak when     performing a lookup of a non-existent memory page.

  - CVE-2005-3109     The HFS and HFS+ (hfsplus) modules allow local attackers     to cause a denial of service (oops) by using hfsplus to     mount a filesystem that is not hfsplus.

  - CVE-2005-3110     A race condition in the ebtables netfilter module on an     SMP system running under high load may allow remote     attackers to cause a denial of service (crash).

  - CVE-2005-3271     Roland McGrath discovered that exec() does not properly     clear posix-timers in multi-threaded environments, which     results in a resource leak and could allow a large     number of multiple local users to cause a denial of     service by using more posix-timers than specified by the     quota for a single user.

  - CVE-2005-3272     The kernel allows remote attackers to poison the bridge     forwarding table using frames that have already been     dropped by filtering, which can cause the bridge to     forward spoofed packets.

  - CVE-2005-3273     The ioctl for the packet radio ROSE protocol does not     properly verify the arguments when setting a new router,     which allows attackers to trigger out-of-bounds errors.

  - CVE-2005-3274     A race condition on SMP systems allows local users to     cause a denial of service (null dereference) by causing     a connection timer to expire while the connection table     is being flushed before the appropriate lock is     acquired.

  - CVE-2005-3275     An error in the NAT code allows remote attackers to     cause a denial of service (memory corruption) by causing     two packets for the same protocol to be NATed at the     same time, which leads to memory corruption.

  - CVE-2005-3276     A missing memory cleanup in the thread handling routines     before copying data into userspace allows a user process     to obtain sensitive information.

This update also contains a number of corrections for issues that turned out to have no security implication afterwards.

The remote CentOS system is missing a security update which has been documented in Red Hat advisory RHSA-2006-0493.

ID	Name	Product	Family	Published	Updated	Severity
65105	Ubuntu 4.10 / 5.10 : linux-source-2.6.8.1/-2.6.10/-2.6.12 vulnerabilities (USN-219-1)	Nessus	Ubuntu Local Security Checks	3/9/2013	1/19/2021	medium
21997	CentOS 4 : kernel (CESA-2006:0493)	Nessus	CentOS Local Security Checks	7/5/2006	1/4/2021	high
21592	RHEL 4 : kernel (RHSA-2006:0493)	Nessus	Red Hat Local Security Checks	5/24/2006	1/14/2021	high
22788	Debian DSA-922-1 : kernel-source-2.6.8 - several vulnerabilities	Nessus	Debian Local Security Checks	10/14/2006	1/4/2021	high
801418	CentOS RHSA-2006-0493 Security Check	Log Correlation Engine	Generic			high

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