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Vigil@nce: Squid, denial of service via DNS

January 2010 by Vigil@nce

An attacker can send truncated DNS packets, in order to stop the
Squid proxy.

 Severity: 1/4
 Consequences: denial of service of service
 Provenance: internet server
 Means of attack: 1 attack
 Ability of attacker: technician (2/4)
 Confidence: unique source (2/5)
 Diffusion of the vulnerable configuration: high (3/3)
 Creation date: 04/01/2010

IMPACTED PRODUCTS

 Squid cache

DESCRIPTION OF THE VULNERABILITY

The Squid proxy implements a DNS resolver, which queries DNS
servers and analyzes its answers.

The rfc1035NameUnpack() function of the lib/rfc1035.c file decodes
DNS packets. However, if the packet is truncated after its header,
this function calls assert() which stops the program.

An attacker, with a malicious DNS server, can therefore answer to
Squid with short packets, in order to generate a denial of service.

CHARACTERISTICS

 Identifiers: BID-37522, VIGILANCE-VUL-9322
 Url: http://vigilance.fr/vulnerability/Squid-denial-of-service-via-DNS-9322


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