FreeBSD : perl -- denial of service via algorithmic complexity attack on hashing routines (68c1f75b-8824-11e2-9996-c48508086173)
High Nessus Plugin ID 65199
SynopsisThe remote FreeBSD host is missing one or more security-related updates.
DescriptionPerl developers report :
In order to prevent an algorithmic complexity attack against its hashing mechanism, perl will sometimes recalculate keys and redistribute the contents of a hash. This mechanism has made perl robust against attacks that have been demonstrated against other systems.
Research by Yves Orton has recently uncovered a flaw in the rehashing code which can result in pathological behavior. This flaw could be exploited to carry out a denial of service attack against code that uses arbitrary user input as hash keys.
Because using user-provided strings as hash keys is a very common operation, we urge users of perl to update their perl executable as soon as possible.
SolutionUpdate the affected packages.