[SECURITY] [DSA 2743-1] kfreebsd-9 security update

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Debian Security Advisory DSA-2743-1 security@debian.org
http://www.debian.org/security/ Aurelien Jarno
August 27, 2013 http://www.debian.org/security/faq
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Package : kfreebsd-9
Vulnerability : privilege escalation/information leak
Problem type : local/remote
Debian-specific: no
CVE Id(s) : CVE-2013-3077 CVE-2013-4851 CVE-2013-5209

Several vulnerabilities have been discovered in the FreeBSD kernel
that may lead to a privilege escalation or information leak. The
Common Vulnerabilities and Exposures project identifies the following
problems:

CVE-2013-3077
Clement Lecigne from the Google Security Team reported an integer
overflow in computing the size of a temporary buffer in the IP
multicast code, which can result in a buffer which is too small
for the requested operation. An unprivileged process can read or
write pages of memory which belong to the kernel. These may lead
to exposure of sensitive information or allow privilege
escalation.

CVE-2013-4851
Rick Macklem, Christopher Key and Tim Zingelman reported that the
FreeBSD kernel incorrectly uses client supplied credentials
instead of the one configured in exports(5) when filling out the
anonymous credential for a NFS export, when -network or -host
restrictions are used at the same time. The remote client may
supply privileged credentials (e.g. the root user) when accessing
a file under the NFS share, which will bypass the normal access
checks.

CVE-2013-5209
Julian Seward and Michael Tuexen reported a kernel memory
disclosure when initializing the SCTP state cookie being sent in
INIT-ACK chunks, a buffer allocated from the kernel stack is not
completely initialized. Fragments of kernel memory may be
included in SCTP packets and transmitted over the network. For
each SCTP session, there are two separate instances in which a
4-byte fragment may be transmitted.

This memory might contain sensitive information, such as portions
of the file cache or terminal buffers. This information might be
directly useful, or it might be leveraged to obtain elevated
privileges in some way. For example, a terminal buffer might
include an user-entered password.

For the stable distribution (wheezy), these problems has been fixed in
version 9.0-10+deb70.3.

We recommend that you upgrade your kfreebsd-9 packages.

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: http://www.debian.org/security/

Mailing list: debian-security-announce@lists.debian.org
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