PT-2022-25142 · Owasp+1 · Owasp Modsecurity Core Rule Set+1

Jan Gora + 1 · Published 2022-09-20 · Updated 2025-08-09 · CVE-2022-39955

Positive Technologies (AI Summary)

CVSS v3.1

9.8

Critical

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions OWASP ModSecurity Core Rule Set (CRS) versions 3.0.x through 3.3.2

Description The issue concerns a partial rule set bypass by submitting a specially crafted HTTP Content-Type header field that indicates multiple character encoding schemes. A vulnerable back-end can potentially be exploited by declaring multiple Content-Type charset names, thereby bypassing the configurable CRS Content-Type header charset allow list. An encoded payload can bypass CRS detection and may then be decoded by the backend.

Recommendations For versions 3.0.x and 3.1.x, upgrade to a newer version as these are legacy and no longer supported. For version 3.2.1, upgrade to 3.2.2. For version 3.3.2, upgrade to 3.3.3. As a temporary workaround, consider restricting the use of multiple charset names in the Content-Type header field to minimize the risk of exploitation.

Fix

Incorrect Authorization

Weakness Enumeration

CWE-863

Related Identifiers

CVE-2022-39955

DLA-3293-1

DLA-4265-1

MGASA-2024-0070

OESA-2022-1964

Affected Products

Debian

Owasp Modsecurity Core Rule Set

References · 33

• https://nvd.nist.gov/vuln/detail/CVE-2022-39955 · Security Note
• https://advisories.mageia.org/MGASA-2024-0070.html · Security Note
• https://lists.fedoraproject.org/archives/list/[e-mail]/thread/C4Q7DCCE37GT5ZBJOWP4NGUD4L3FAMDB · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2022-39955 · Vendor Advisory
• https://osv.dev/vulnerability/MGASA-2024-0070 · Vendor Advisory
• https://coreruleset.org/20220919/crs-version-3-3-3-and-3-2-2-covering-several-cves · Vendor Advisory
• https://ubuntu.com/security/CVE-2022-39955 · Vendor Advisory
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PD56EAYNGB6E6QQH62LAYCONOP6OH5DZ · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2022-39956 · Security Note
• https://osv.dev/vulnerability/OESA-2022-1964 · Vendor Advisory
• https://security.gentoo.org/glsa/202305-25 · Vendor Advisory
• https://osv.dev/vulnerability/DLA-3293-1 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2022-39955 · Security Note
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HL2L2GF7GOCWPMJZDUE5OXDSXHGG3XUJ · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2022-39955 · Vendor Advisory