Several security issues were fixed in the kernel.
Emese Revfy discovered that in the Linux kernel signal handlers could leak address information across an exec, making it possible to by pass ASLR (Address Space Layout Randomization). A local user could use this flaw to by pass ASLR to reliably deliver an exploit payload that would otherwise be stopped (by ASLR). (CVE-2013-0914)
8 April 2013
A security issue affects these releases of Ubuntu and its derivatives:
Several security issues were fixed in the kernel.
Emese Revfy discovered that in the Linux kernel signal handlers could leak address information across an exec, making it possible to by pass ASLR (Address Space Layout Randomization). A local user could use this flaw to by pass ASLR to reliably deliver an exploit payload that would otherwise be stopped (by ASLR). (CVE-2013-0914)
A memory use after free error was discover in the Linux kernel’s tmpfs filesystem. A local user could exploit this flaw to gain privileges or cause a denial of service (system crash). (CVE-2013-1767)
Mateusz Guzik discovered a race in the Linux kernel’s keyring. A local user could exploit this flaw to cause a denial of service (system crash). (CVE-2013-1792)
Mathias Krause discovered a memory leak in the Linux kernel’s crypto report API. A local user with CAP_NET_ADMIN could exploit this leak to examine some of the kernel’s stack memory. (CVE-2013-2546)
Mathias Krause discovered a memory leak in the Linux kernel’s crypto report API. A local user with CAP_NET_ADMIN could exploit this leak to examine some of the kernel’s heap memory. (CVE-2013-2547)
Mathias Krause discovered information leaks in the Linux kernel’s crypto algorithm report API. A local user could exploit these flaws to leak kernel stack and heap memory contents. (CVE-2013-2548)
The problem can be corrected by updating your system to the following package versions:
To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.
After a standard system update you need to reboot your computer to make all the necessary changes.
ATTENTION: Due to an unavoidable ABI change the kernel updates have been given a new version number, which requires you to recompile and reinstall all third party kernel modules you might have installed. If you use linux-restricted-modules, you have to update that package as well to get modules which work with the new kernel version. Unless you manually uninstalled the standard kernel metapackages (e.g. linux-generic, linux-server, linux-powerpc), a standard system upgrade will automatically perform this as well.
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