USN-509-1: Linux kernel vulnerabilities

Ubuntu Security Notice USN-509-1

30th August, 2007

linux-source-2.6.17 vulnerabilities

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

  • Ubuntu 6.10

Software description

  • linux-source-2.6.17

Details

A flaw in the sysfs_readdir function allowed a local user to cause a
denial of service by dereferencing a NULL pointer. (CVE-2007-3104)

A buffer overflow was discovered in the random number generator. In
environments with granular assignment of root privileges, a local attacker
could gain additional privileges. (CVE-2007-3105)

A flaw was discovered in the usblcd driver. A local attacker could cause
large amounts of kernel memory consumption, leading to a denial of service.
(CVE-2007-3513)

It was discovered that certain setuid-root processes did not correctly
reset process death signal handlers. A local user could manipulate this
to send signals to processes they would not normally have access to.
(CVE-2007-3848)

The Direct Rendering Manager for the i915 driver could be made to write
to arbitrary memory locations. An attacker with access to a running X11
session could send a specially crafted buffer and gain root privileges.
(CVE-2007-3851)

It was discovered that the aacraid SCSI driver did not correctly check
permissions on certain ioctls. A local attacker could cause a denial
of service or gain privileges. (CVE-2007-4308)

Update instructions

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

Ubuntu 6.10:
linux-image-2.6.17-12-mckinley 2.6.17.1-12.40
linux-image-2.6.17-12-powerpc64-smp 2.6.17.1-12.40
linux-image-2.6.17-12-server-bigiron 2.6.17.1-12.40
linux-image-2.6.17-12-hppa64 2.6.17.1-12.40
linux-image-2.6.17-12-sparc64-smp 2.6.17.1-12.40
linux-image-2.6.17-12-generic 2.6.17.1-12.40
linux-image-2.6.17-12-powerpc-smp 2.6.17.1-12.40
linux-image-2.6.17-12-itanium 2.6.17.1-12.40
linux-image-2.6.17-12-hppa32 2.6.17.1-12.40
linux-image-2.6.17-12-386 2.6.17.1-12.40
linux-image-2.6.17-12-powerpc 2.6.17.1-12.40
linux-image-2.6.17-12-sparc64 2.6.17.1-12.40
linux-image-2.6.17-12-server 2.6.17.1-12.40

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

CVE-2007-3104, CVE-2007-3105, CVE-2007-3513, CVE-2007-3848, CVE-2007-3851, CVE-2007-4308