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Vigil@nce - rsync: file not synchronized via MD5 collisions

July 2014 by Vigil@nce

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

SYNTHESIS OF THE VULNERABILITY

A local attacker can trigger MD5 collisions in rsync, in order to
prevent file synchronization.

Impacted products: Unix (platform)

Severity: 1/4

Creation date: 28/07/2014

DESCRIPTION OF THE VULNERABILITY

The rsync tool is is used to synchronize files between hosts.

Files to be transfered are recognized by a MD5 hash change.
However, a local attacker can alter a file that keeps its MD5
fingerprint.

A local attacker can therefore trigger MD5 collisions in rsync, in
order to prevent file synchronization.

ACCESS TO THE COMPLETE VIGIL@NCE BULLETIN

http://vigilance.fr/vulnerability/rsync-file-not-synchronized-via-MD5-collisions-15103


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