Detections
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CentOS 5 : dnsmasq (CESA-2009:1238)
medium Nessus Plugin ID 43778
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Synopsis
The remote CentOS host is missing a security update.Description
An updated dnsmasq package that fixes two security issues is now available for Red Hat Enterprise Linux 5.This update has been rated as having important security impact by the Red Hat Security Response Team.
Dnsmasq is a lightweight and easy to configure DNS forwarder and DHCP server.
Core Security Technologies discovered a heap overflow flaw in dnsmasq when the TFTP service is enabled (the '--enable-tftp' command line option, or by enabling 'enable-tftp' in '/etc/dnsmasq.conf'). If the configured tftp-root is sufficiently long, and a remote user sends a request that sends a long file name, dnsmasq could crash or, possibly, execute arbitrary code with the privileges of the dnsmasq service (usually the unprivileged 'nobody' user). (CVE-2009-2957)
A NULL pointer dereference flaw was discovered in dnsmasq when the TFTP service is enabled. This flaw could allow a malicious TFTP client to crash the dnsmasq service. (CVE-2009-2958)
Note: The default tftp-root is '/var/ftpd', which is short enough to make it difficult to exploit the CVE-2009-2957 issue; if a longer directory name is used, arbitrary code execution may be possible. As well, the dnsmasq package distributed by Red Hat does not have TFTP support enabled by default.
All users of dnsmasq should upgrade to this updated package, which contains a backported patch to correct these issues. After installing the updated package, the dnsmasq service must be restarted for the update to take effect.
Solution
Update the affected dnsmasq package.See Also
Plugin Details
Severity: Medium
ID: 43778
File Name: centos_RHSA-2009-1238.nasl
Version: 1.16
Type: local
Agent: unix
Family: CentOS Local Security Checks
Published: 1/6/2010
Updated: 1/4/2021
Supported Sensors: Agentless Assessment, Frictionless Assessment Agent, Frictionless Assessment AWS, Frictionless Assessment Azure, Nessus
Risk Information
VPR
Risk Factor: Medium
Score: 6.7
CVSS v2
Risk Factor: Medium
Base Score: 6.8
Temporal Score: 5.3
Vector: CVSS2#AV:N/AC:M/Au:N/C:P/I:P/A:P
Vulnerability Information
CPE: p-cpe:/a:centos:centos:dnsmasq, cpe:/o:centos:centos:5
Required KB Items: Host/local_checks_enabled, Host/CentOS/release, Host/CentOS/rpm-list
Exploit Available: true
Exploit Ease: Exploits are available
Patch Publication Date: 9/1/2009
Vulnerability Publication Date: 9/2/2009
Reference Information
CVE: CVE-2009-2957, CVE-2009-2958
BID: 36120