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Vulnerability of SPIP: denial of service via an update

Synthesis of the vulnerability 

An attacker with SPIP author privileges can start an update procedure, in order to create a denial of service.
Impacted products: Debian, SPIP.
Severity of this bulletin: 1/4.
Creation date: 07/04/2011.
Références of this threat: BID-47302, CERTA-2003-AVI-001, CERTA-2011-AVI-196, DSA-2229-1, VIGILANCE-VUL-10527.

Description of the vulnerability 

The ecrire/exec/upgrade.php page is used to update the installed SPIP version. Only the administrator should be allowed to access to this page.

However, an author is also allowed to call upgrade.php. The procedure fails, but SPIP is left in a nonfunctional state.

An attacker with SPIP author privileges can therefore start an update procedure, in order to create a denial of service.
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This weakness bulletin impacts software or systems such as Debian, SPIP.

Our Vigil@nce team determined that the severity of this computer weakness is low.

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

A proof of concept or an attack tool is available, so your teams have to process this alert. An attacker with a technician ability can exploit this vulnerability announce.

Solutions for this threat 

SPIP: version 2.1.10.
The version 2.1.10 is corrected:
  http://www.spip.net/fr_download

SPIP: version 2.0.15.
The version 2.0.15 is corrected:
  http://files.spip.org/spip/archives/

Debian: new spip packages.
New packages are available:
  spip 2.1.1-3squeeze1
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