[Secure-testing-team] Bug#754237: kfreebsd-9: SCTP kernel memory disclosures (CVE-2014-3953)

[Steven Chamberlain]

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

Hi,

FreeBSD-SA-14:17.kmem describes kernel memory disclosures in
SCTP control messages:

http://security.freebsd.org/advisories/FreeBSD-SA-14:17.kmem.asc
> [...] the process may be able to retrieve 2 bytes of kernel memory
> for all three control messages, plus 92 bytes for SCTP_SNDRCV and 76
> bytes for SCTP_EXTRCV.  If the local process is permitted to receive
> SCTP notification, a maximum of 112 bytes of kernel memory may be
> returned to userland.

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

I'm not sure if SCTP must be configured by a superuser first, but for
now I'll assume any nonprivileged user might be able to exploit this.

-- 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