USN-751-1: Linux kernel vulnerabilities

6 April 2009

linux, linux-source-2.6.22 vulnerabilities

A security issue affects these releases of Ubuntu and its derivatives:

  • Ubuntu 8.10
  • Ubuntu 8.04 LTS
  • Ubuntu 7.10

Software Description

  • linux
  • linux-source-2.6.22

Details

NFS did not correctly handle races between fcntl and interrupts. A local attacker on an NFS mount could consume unlimited kernel memory, leading to a denial of service. Ubuntu 8.10 was not affected. (CVE-2008-4307)

Sparc syscalls did not correctly check mmap regions. A local attacker could cause a system panic, leading to a denial of service. Ubuntu 8.10 was not affected. (CVE-2008-6107)

In certain situations, cloned processes were able to send signals to parent processes, crossing privilege boundaries. A local attacker could send arbitrary signals to parent processes, leading to a denial of service. (CVE-2009-0028)

The kernel keyring did not free memory correctly. A local attacker could consume unlimited kernel memory, leading to a denial of service. (CVE-2009-0031)

The SCTP stack did not correctly validate FORWARD-TSN packets. A remote attacker could send specially crafted SCTP traffic causing a system crash, leading to a denial of service. (CVE-2009-0065)

The eCryptfs filesystem did not correctly handle certain VFS return codes. A local attacker with write-access to an eCryptfs filesystem could cause a system crash, leading to a denial of service. (CVE-2009-0269)

The Dell platform device did not correctly validate user parameters. A local attacker could perform specially crafted reads to crash the system, leading to a denial of service. (CVE-2009-0322)

The page fault handler could consume stack memory. A local attacker could exploit this to crash the system or gain root privileges with a Kprobe registered. Only Ubuntu 8.10 was affected. (CVE-2009-0605)

Network interfaces statistics for the SysKonnect FDDI driver did not check capabilities. A local user could reset statistics, potentially interfering with packet accounting systems. (CVE-2009-0675)

The getsockopt function did not correctly clear certain parameters. A local attacker could read leaked kernel memory, leading to a loss of privacy. (CVE-2009-0676)

The ext4 filesystem did not correctly clear group descriptors when resizing. A local attacker could exploit this to crash the system, leading to a denial of service. (CVE-2009-0745)

The ext4 filesystem did not correctly validate certain fields. A local attacker could mount a malicious ext4 filesystem, causing a system crash, leading to a denial of service. (CVE-2009-0746, CVE-2009-0747, CVE-2009-0748)

The syscall interface did not correctly validate parameters when crossing the 64-bit/32-bit boundary. A local attacker could bypass certain syscall restricts via crafted syscalls. (CVE-2009-0834, CVE-2009-0835)

The shared memory subsystem did not correctly handle certain shmctl calls when CONFIG_SHMEM was disabled. Ubuntu kernels were not vulnerable, since CONFIG_SHMEM is enabled by default. (CVE-2009-0859)

The virtual consoles did not correctly handle certain UTF-8 sequences. A local attacker on the physical console could exploit this to cause a system crash, leading to a denial of service. (CVE-2009-1046)

Update instructions

The problem can be corrected by updating your system to the following package versions:

Ubuntu 8.10
linux-image-2.6.27-11-generic - 2.6.27-11.31
linux-image-2.6.27-11-server - 2.6.27-11.31
linux-image-2.6.27-11-virtual - 2.6.27-11.31
Ubuntu 8.04 LTS
linux-image-2.6.24-23-386 - 2.6.24-23.52
linux-image-2.6.24-23-generic - 2.6.24-23.52
linux-image-2.6.24-23-hppa32 - 2.6.24-23.52
linux-image-2.6.24-23-hppa64 - 2.6.24-23.52
linux-image-2.6.24-23-itanium - 2.6.24-23.52
linux-image-2.6.24-23-lpia - 2.6.24-23.52
linux-image-2.6.24-23-lpiacompat - 2.6.24-23.52
linux-image-2.6.24-23-mckinley - 2.6.24-23.52
linux-image-2.6.24-23-openvz - 2.6.24-23.52
linux-image-2.6.24-23-powerpc - 2.6.24-23.52
linux-image-2.6.24-23-powerpc-smp - 2.6.24-23.52
linux-image-2.6.24-23-powerpc64-smp - 2.6.24-23.52
linux-image-2.6.24-23-rt - 2.6.24-23.52
linux-image-2.6.24-23-server - 2.6.24-23.52
linux-image-2.6.24-23-sparc64 - 2.6.24-23.52
linux-image-2.6.24-23-sparc64-smp - 2.6.24-23.52
linux-image-2.6.24-23-virtual - 2.6.24-23.52
linux-image-2.6.24-23-xen - 2.6.24-23.52
Ubuntu 7.10
linux-image-2.6.22-16-386 - 2.6.22-16.62
linux-image-2.6.22-16-cell - 2.6.22-16.62
linux-image-2.6.22-16-generic - 2.6.22-16.62
linux-image-2.6.22-16-hppa32 - 2.6.22-16.62
linux-image-2.6.22-16-hppa64 - 2.6.22-16.62
linux-image-2.6.22-16-itanium - 2.6.22-16.62
linux-image-2.6.22-16-lpia - 2.6.22-16.62
linux-image-2.6.22-16-lpiacompat - 2.6.22-16.62
linux-image-2.6.22-16-mckinley - 2.6.22-16.62
linux-image-2.6.22-16-powerpc - 2.6.22-16.62
linux-image-2.6.22-16-powerpc-smp - 2.6.22-16.62
linux-image-2.6.22-16-powerpc64-smp - 2.6.22-16.62
linux-image-2.6.22-16-rt - 2.6.22-16.62
linux-image-2.6.22-16-server - 2.6.22-16.62
linux-image-2.6.22-16-sparc64 - 2.6.22-16.62
linux-image-2.6.22-16-sparc64-smp - 2.6.22-16.62
linux-image-2.6.22-16-ume - 2.6.22-16.62
linux-image-2.6.22-16-virtual - 2.6.22-16.62
linux-image-2.6.22-16-xen - 2.6.22-16.62

To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.

After a standard system upgrade you need to reboot your computer to effect the necessary changes.

References