SB2013060404 - Cryptographic issues in xen (Alpine package)

Description

This security bulletin contains information about 1 security vulnerability.

1) Cryptographic issues (CVE-ID: CVE-2006-1056)

The vulnerability allows a local non-authenticated attacker to gain access to sensitive information.

The Linux kernel before 2.6.16.9 and the FreeBSD kernel, when running on AMD64 and other 7th and 8th generation AuthenticAMD processors, only save/restore the FOP, FIP, and FDP x87 registers in FXSAVE/FXRSTOR when an exception is pending, which allows one process to determine portions of the state of floating point instructions of other processes, which can be leveraged to obtain sensitive information such as cryptographic keys. NOTE: this is the documented behavior of AMD64 processors, but it is inconsistent with Intel processors in a security-relevant fashion that was not addressed by the kernels. Upgrade to Linux Kernel version 2.6.16.9 : http://www.kernel.org/

Remediation

Install update from vendor's website.

References

• https://git.alpinelinux.org/aports/commit/?id=a2883b66233b3bc958ccb3555996adeacd070c64
• https://git.alpinelinux.org/aports/commit/?id=9da25b8784e5b39b905e86bdb94e5a0026f10bd4
• https://git.alpinelinux.org/aports/commit/?id=e466dbbf828a8e83c3f34d7311afcaf02e1d2408
• https://git.alpinelinux.org/aports/commit/?id=f6e99451d47fbe7cdb852f48dd11006808db52ae