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Vigil@nce - D-Bus : file corruption during the installation

juin 2011 par Vigil@nce

This bulletin was written by Vigil@nce : http://vigilance.fr/

SYNTHESIS OF THE VULNERABILITY

When the administrator installs D-Bus, a local attacker can create a symbolic link, in order to corrupt the file.

Severity : 1/4

Creation date : 24/06/2011

IMPACTED PRODUCTS

- Unix - plateform

DESCRIPTION OF THE VULNERABILITY

The D-Bus service is used by applications to communicate via messages sent on a bus.

The administrator runs the "./configure" script, in order to install D-Bus. The cc_supports_flag() function of this script detects flags supported by the gcc compiler. In order to do so, it creates a temporary C file and compiles it. However, this temporary file has a predictable name (/tmp/foo$PID) and it is located in a publicly writable directory.

When the administrator installs D-Bus, a local attacker can therefore create a symbolic link, in order to corrupt the file.

ACCESS TO THE COMPLETE VIGIL@NCE BULLETIN

http://vigilance.fr/vulnerability/D...




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