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CVE-2020-15598

Status Candidate

Overview

** DISPUTED ** Trustwave ModSecurity 3.x through 3.0.4 allows denial of service via a special request. NOTE: The discoverer reports "Trustwave has signaled they are disputing our claims." The CVE suggests that there is a security issue with how ModSecurity handles regular expressions that can result in a Denial of Service condition. The vendor does not consider this as a security issue because1) there is no default configuration issue here. An attacker would need to know that a rule using a potentially problematic regular expression was in place, 2) the attacker would need to know the basic nature of the regular expression itself to exploit any resource issues. It's well known that regular expression usage can be taxing on system resources regardless of the use case. It is up to the administrator to decide on when it is appropriate to trade resources for potential security benefit.

Related Files

Debian Security Advisory 4765-1
Posted Sep 28, 2020
Authored by Debian | Site debian.org

Debian Linux Security Advisory 4765-1 - Ervin Hegedues discovered that ModSecurity v3 enabled global regular expression matching which could result in denial of service. For additional information please refer to https://coreruleset.org/20200914/cve-2020-15598/

tags | advisory, web, denial of service
systems | linux, debian
advisories | CVE-2020-15598
SHA-256 | be3b055743eb57fe9c8abc5054dbd71e1eb1dafc84281ecf5a897604f777f6a0
ModSecurity 3.0.x Denial Of Service
Posted Sep 15, 2020
Authored by Christian Folini

ModSecurity version 3.0.x suffers from a denial of service vulnerability due to the handling of regular expression matching. ModSecurity version 3.0.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.

tags | advisory, denial of service
advisories | CVE-2020-15598
SHA-256 | df79f2392e827d107f0ec05ae4fe67b4b9956f6a18d720baf532bbded9256ab4
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