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Test ID:1.3.6.1.4.1.25623.1.0.702743
Category:Debian Local Security Checks
Title:Debian Security Advisory DSA 2743-1 (kfreebsd-9 - privilege escalation/information leak)
Summary: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.
Description:Summary:
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.

Affected Software/OS:
kfreebsd-9 on Debian Linux

Solution:
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.

CVSS Score:
7.8

CVSS Vector:
AV:N/AC:L/Au:N/C:C/I:N/A:N

Cross-Ref: Common Vulnerability Exposure (CVE) ID: CVE-2013-5209
BugTraq ID: 61939
http://www.securityfocus.com/bid/61939
FreeBSD Security Advisory: FreeBSD-SA-13:08
http://www.freebsd.org/security/advisories/FreeBSD-SA-13:10.sctp.asc
https://bugzilla.mozilla.org/show_bug.cgi?id=905080
http://www.securitytracker.com/id/1028940
Common Vulnerability Exposure (CVE) ID: CVE-2013-3077
http://www.freebsd.org/security/advisories/FreeBSD-SA-13:09.ip_multicast.asc
Common Vulnerability Exposure (CVE) ID: CVE-2013-4851
BugTraq ID: 61484
http://www.securityfocus.com/bid/61484
http://www.freebsd.org/security/advisories/FreeBSD-SA-13:08.nfsserver.asc
CopyrightCopyright (C) 2013 Greenbone Networks GmbH http://greenbone.net

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