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Vigil@nce: CUPS, denial of service via add-rss-subscription

November 2008 by Vigil@nce


An attacker can use the add-rss-subscription feature of CUPS in order to stop it.

Gravity: 1/4

Consequences: denial of service of service

Provenance: document

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: 19/11/2008

- Unix - plateform


The cgi-bin/admin script of CUPS implements several operations:
- start-printer : start the printer
- set-printer-options : change its options
- add-rss-subscription : subscribe to a RSS feed reporting log events

When the "add-rss-subscription" feature is called more than 100 (MaxSubscriptions) times, a NULL pointer is dereferenced and stops CUPS.

To setup this attack, the attacker can create a HTML page containing 101 urls pointing to the feed to subscribe, and then invite the victim to display this HTML page.

An attacker can therefore create a malicious HTML page and invite the victim to read it in order to stop CUPS.


Identifiers: VIGILANCE-VUL-8258

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