CVE-2023-22795

Description

A regular expression based DoS vulnerability in Action Dispatch <6.1.7.1 and <7.0.4.1 related to the If-None-Match header. A specially crafted HTTP If-None-Match header can cause the regular expression engine to enter a state of catastrophic backtracking, when on a version of Ruby below 3.2.0. This can cause the process to use large amounts of CPU and memory, leading to a possible DoS vulnerability All users running an affected release should either upgrade or use one of the workarounds immediately.

How to fix CVE-2023-22795

To remediate CVE-2023-22795, upgrade the affected package to a fixed version below.

• —upgrade to 2:6.0.3.7+dfsg-2+deb11u1 or later
• —upgrade to 6.1.7.1 or later

Is CVE-2023-22795 being exploited?

Low — EPSS is 1.3%, meaning exploitation activity has not been observed at scale.

Affected packages (2)

• from 0, < 2:6.0.3.7+dfsg-2+deb11u1
• >= 4.0.0.beta1, < 6.1.7.1

CVSS scores

References (11)

• ADVISORYnvd.nist.gov/vuln/detail/CVE-2023-22795
• ADVISORYsecurity-tracker.debian.org/tracker/CVE-2023-22795
• PATCHgithub.com/rails/rails
• WEBdiscuss.rubyonrails.org/t/cve-2023-22795-possible-redos-based-dos-vulnerability-in-action-dispatch/82118