Ubuntu 4.10 / 5.04 / 5.10 : linux-source-22.214.171.124/-2.6.10/-2.6.12 vulnerabilities (USN-263-1)
High Nessus Plugin ID 21070
SynopsisThe remote Ubuntu host is missing one or more security-related patches.
DescriptionA flaw was found in the module reference counting for loadable protocol modules of netfilter. By performing particular socket operations, a local attacker could exploit this to crash the kernel.
This flaw only affects Ubuntu 5.10. (CVE-2005-3359)
David Howells noticed a race condition in the add_key(), request_key() and keyctl() functions. By modifying the length of string arguments after the kernel determined their length, but before the kernel copied them into kernel memory, a local attacker could either crash the kernel or read random parts of kernel memory (which could potentially contain sensitive data). (CVE-2006-0457)
An information disclosure vulnerability was discovered in the ftruncate() function for the XFS file system. Under certain conditions, this function could expose random unallocated blocks. A local user could potentially exploit this to recover sensitive data from previously deleted files. (CVE-2006-0554)
A local Denial of Service vulnerability was found in the NFS client module. By opening a file on an NFS share with O_DIRECT and performing some special operations on it, a local attacker could trigger a kernel crash. (CVE-2006-0555)
The ELF binary loader did not sufficiently verify some addresses in the ELF headers. By attempting to execute a specially crafted program, a local attacker could exploit this to trigger a recursive loop of kernel errors, which finally ended in a kernel crash. This only affects the amd64 architecture on Intel processors (EMT64).
The die_if_kernel() function was incorrectly declared as 'does never return' on the ia64 platform. A local attacker could exploit this to crash the kernel. Please note that ia64 is not an officially supported platform. (CVE-2006-0742)
Oleg Nesterov discovered a race condition in the signal handling. On multiprocessor (SMP) machines, a local attacker could exploit this to create many unkillable processes, which could eventually lead to a Denial of Service.
A memory leak was discovered in the handling of files which were opened with the O_DIRECT flag. By repeatedly opening files in a special way, a local attacker could eventually drain all available kernel memory and render the machine unusable. This flaw only affects Ubuntu 4.10.
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.
SolutionUpdate the affected packages.