The Vigil@nce team watches public vulnerabilities impacting your computers, and then offers security solutions, a vigilance database and tools to fix them.

Vulnerability of Squid 2: denial of service via ICAP

Synthesis of the vulnerability 

An authenticated attacker can force ICAP to consume all memory of proxy.
Impacted software: Squid, Squid ICAP.
Severity of this computer vulnerability: 1/4.
Creation date: 11/12/2007.
Références of this announce: VIGILANCE-VUL-7402.

Description of the vulnerability 

The ICAP protocol (Internet Content Adaptation Protocol, RFC 3507) permits to change the stream handling in the proxy, in order for example to transmit data to an antivirus.

When an user clicks on a file to download, but waits without indicating where to save it, data from file are transferred via ICAP but are not transmitted to the user. These temporary data are only stored in the memory.

An attacker can therefore request Squid to download a big file and wait for its data to exhaust the memory of proxy. The authenticated attacker can thus create a denial of service.
Full bulletin, software filtering, emails, fixes, ... (Request your free trial)

This threat announce impacts software or systems such as Squid, Squid ICAP.

Our Vigil@nce team determined that the severity of this cybersecurity alert is low.

The trust level is of type confirmed by the editor, with an origin of user account.

An attacker with a expert ability can exploit this security alert.

Solutions for this threat 

Squid 2: patch for ICAP.
A patch is available.
Full bulletin, software filtering, emails, fixes, ... (Request your free trial)

Computer vulnerabilities tracking service 

Vigil@nce provides system vulnerability bulletins. The Vigil@nce team tracks computer vulnerabilities impacting systems and applications.