ModSecurity v3 affected by DoS (CVE-2020-15598)

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Posted by Christian Folini on Sep 15

ModSecurity v3.0.x is affected by a Denial of Service vulnerability due to the
global matching of regular expressions. The combination of a non-anchored
regular expression and the ModSecurity “capture” action can be exploited via a
specially crafted payload.

While ModSecurity v2.x used to quit the execution of a regular expression
after the first match. ModSecurity v3.0.x silently changed the behavior to
global matching. This results in a…

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