Resource exhaustion in ModSecurity - CVE-2020-15598
Published: September 16, 2020 / Updated: July 8, 2021
Vulnerability identifier: #VU46766
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2020-15598
CWE-ID: CWE-400
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to application does not properly control consumption of internal resources while performing global matching of regular expressions in a combination of the ModSecurity “capture” action. A remote attacker can send a specially crafted HTTP request to the server and perform a denial of service (DoS) attack.
Affected software
ModSecurity
modsecurity (Debian package)
libmodsecurity
Fedora
modsecurity (Debian package)
libmodsecurity
Fedora
How to mitigate CVE-2020-15598
Install update from vendor's website.
ModSecurity - update to 3.0.5
modsecurity (Debian package) - update to 3.0.3-1+deb10u2
libmodsecurity - update to 3.0.9-2.el7
modsecurity (Debian package) - update to 3.0.3-1+deb10u2
libmodsecurity - update to 3.0.9-2.el7