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Revision:  436864
Date:      2017-03-25
Time:      00:01:54Z
Committer: timur

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VuXML IDDescription
68c1f75b-8824-11e2-9996-c48508086173perl -- denial of service via algorithmic complexity attack on hashing routines

Perl 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.

Discovery 2013-03-04
Entry 2013-03-10
Modified 2016-08-22
lt 5.12.4_5

ge 5.14.0 lt 5.14.2_3

ge 5.16.0 lt 5.16.2_1