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Home >> Browse Vulnerability Assessment Database >> Gentoo Local Security Checks >> [GLSA-200504-03] Dnsmasq: Poisoning and Denial of Service vulnerabilities


Vulnerability Assessment Details

[GLSA-200504-03] Dnsmasq: Poisoning and Denial of Service vulnerabilities

Vulnerability Assessment Summary
Dnsmasq: Poisoning and Denial of Service vulnerabilities

Detailed Explanation for this Vulnerability Assessment
The remote host is affected by the vulnerability described in GLSA-200504-03
(Dnsmasq: Poisoning and Denial of Service vulnerabilities)


Dnsmasq does not properly detect that DNS replies received do not
correspond to any DNS query that was sent. Rob Holland of the Gentoo
Linux Security Audit team also discovered two off-by-one buffer
overflows that could crash DHCP lease files parsing.

Impact

A remote attacker could send malicious answers to insert arbitrary
DNS data into the Dnsmasq cache. These attacks would in turn help an
attacker to perform man-in-the-middle and site impersonation attacks.
The buffer overflows might permit a possible hacker on the local network to
crash Dnsmasq upon restart.

Workaround

There is no known workaround at this time.

References:
http://www.thekelleys.org.uk/dnsmasq/CHANGELOG


Solution:
All Dnsmasq users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose ">=net-dns/dnsmasq-2.22"


Network Security Threat Level: Low


Networks Security ID:

Vulnerability Assessment Copyright: (C) 2005 Michel Arboi

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