[Secure-testing-team] Bug#754236: kfreebsd-9: sockbuf CMSG kernel memory disclosure (CVE-2014-3952)

[Steven Chamberlain]

Package: src:kfreebsd-9
Version: 9.0-10+deb70.7
Severity: important
Tags: security upstream
Control: found -1 kfreebsd-9/9.2-2

Hi,

FreeBSD-SA-14:17.kmem describes a kernel memory disclosure
(of up to 4 bytes) by control messages in kern/uipc_sockbuf.c

http://security.freebsd.org/advisories/FreeBSD-SA-14:17.kmem.asc
> Buffer between control message header and data may not be completely
> initialized before being copied to userland. [CVE-2014-3952]

I think this affects all our kernels including 8.3 and 9.0 in wheezy.

-- System Information:
Debian Release: 7.1
  APT prefers proposed-updates
  APT policy: (500, 'proposed-updates'), (500, 'stable')
Architecture: kfreebsd-amd64 (x86_64)

Kernel: kFreeBSD 9.0-2-amd64-xenhvm-ipsec
Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash