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Vigil@nce: cURL, local file reading

March 2009 by Vigil@nce

SYNTHESIS OF THE VULNERABILITY

An attacker can use a redirect to force cURL to read a local file.

Gravity: 2/4

Consequences: user access/rights, data reading

Provenance: internet server

Means of attack: 1 attack

Ability of attacker: technician (2/4)

Confidence: confirmed by the editor (5/5)

Diffusion of the vulnerable configuration: high (3/3)

Creation date: 03/03/2009

IMPACTED PRODUCTS

 cURL
 Fedora
 Mandriva Corporate
 Mandriva Linux
 Mandriva Multi Network Firewall

DESCRIPTION OF THE VULNERABILITY

The cURL, and the libcurl library, can download documents with
several protocols:

http://site/doc

ftp://site/doc

file///tmp/doc

etc.

The HTTP protocol can redirect a query via the Location header.
For example, cURL can request http://site/doc, and the site can
indicate to go to http://site2/doc.

However, cURL also accepts redirections using a non web protocol.
For example, cURL can request http://attaquant/doc, and the site
can indicate to go to file:///tmp/doc. The cURL program thus uses
the /tmp/doc file. Depending on the context, this file can then
for example be stored on a public web site, where the attacker
will be able to read it.

An attacker can therefore use a redirect to force cURL to read a
local file.

CHARACTERISTICS

Identifiers: adv_20090303, BID-33962, CVE-2009-0037,
FEDORA-2009-2247, FEDORA-2009-2265, MDVSA-2009:069,
VIGILANCE-VUL-8501

http://vigilance.fr/vulnerability/cURL-local-file-reading-8501


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