FortiOS vulnerability

What happened

An Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Response Splitting') vulnerability [CWE-113] vulnerability in Fortinet FortiOS 7.6.0 through 7.6.4, FortiOS 7.4 all versions, FortiOS 7.2 all versions, FortiProxy 7.6.0 through 7.6.4, FortiProxy 7.4 all versions, FortiProxy 7.2 all versions may allow an attacker in possession of a valid web filter override token to inject arbitrary headers via tricking a user into clicking on a crafted link.

Affected versions

FortiOS: 7.6.0 through 7.6.4 (semver); 7.4.0 through 7.4.12 (semver); 7.2.0 through 7.2.13 (semver); 7.0.0 through 7.0.19 (semver); 6.4.0 through 6.4.16 (semver); 1.7.0; 1.6.0 through 1.6.2 (semver); 1.5.0 through 1.5.1 (semver); 1.4.0 through 1.4.3 (semver); 1.3.0 through 1.3.1 (semver); 1.2.0; 1.1.0 through 1.1.2 (semver); 1.0.0 through 1.0.3 (semver); 7.4.0 through 7.4.14 (semver); 7.2.0 through 7.2.16 (semver); 7.0.0 through 7.0.23 (semver); before * (custom) Fixed: See vendor advisory.

Why it matters

Review the vendor advisory and exposure of the affected product to determine operational impact.

Detection & mitigation

• Apply vendor-provided updates or mitigations.
• Review affected product exposure and access logs.