Debian DSA-2743-1 : kfreebsd-9 - privilege escalation/information leak

high Nessus Plugin ID 69483

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Synopsis

The remote Debian host is missing a security-related update.

Description

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.

Solution

Upgrade the kfreebsd-9 packages.

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

Plugin Details

Severity: High

ID: 69483

File Name: debian_DSA-2743.nasl

Version: 1.11

Type: local

Agent: unix

Family: Debian Local Security Checks

Published: 8/28/2013

Updated: 1/11/2021

Supported Sensors: Frictionless Assessment Agent, Nessus Agent, Agentless Assessment, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 5.9

CVSS v2

Risk Factor: High

Base Score: 7.8

Temporal Score: 5.8

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:N/A:N

Vulnerability Information

CPE: p-cpe:/a:debian:debian_linux:kfreebsd-9, cpe:/o:debian:debian_linux:7.0

Required KB Items: Host/local_checks_enabled, Host/Debian/release, Host/Debian/dpkg-l

Exploit Ease: No known exploits are available

Patch Publication Date: 8/27/2013

Reference Information

CVE: CVE-2013-3077, CVE-2013-4851, CVE-2013-5209

BID: 61484, 61939, 61946

DSA: 2743

Detections

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