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SYNTHESIS OF THE VULNERABILITY

An attacker can use an invalid login name, to generate an infinite
loop in the check_secret() function of rsync, in order to trigger
a denial of service.

– Impacted products: Fedora, Ubuntu, Unix (platform)
– Severity: 2/4
– Creation date: 14/04/2014

DESCRIPTION OF THE VULNERABILITY

The rsync product is used to synchronize two directories.

The check_secret() function of the authenticate.c file of the
rsync daemon checks if the user who requests an authentication
exists in the password file ("secrets file"). However, if the user
does not exist, an infinite loop occurs.

An attacker can therefore use an invalid login name, to generate
an infinite loop in the check_secret() function of rsync, in order
to trigger a denial of service.

ACCESS TO THE COMPLETE VIGIL@NCE BULLETIN

http://vigilance.fr/vulnerability/rsync-denial-of-service-via-check-secret-14588