jhawthorn
(John Hawthorn)
1
There is a possible regular expression based DoS vulnerability in Action
Dispatch. This vulnerability has been assigned the CVE identifier
CVE-2023-22792.
Versions Affected: >= 3.0.0
Not affected: < 3.0.0
Fixed Versions: 6.1.7.1, 7.0.4.1
Impact
Specially crafted cookies, in combination with a specially crafted
X_FORWARDED_HOST header can cause the regular expression engine to enter a
state of catastrophic backtracking. 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.
Releases
The FIXED releases are available at the normal locations.
Workarounds
We recommend that all users upgrade to one of the FIXED versions. In the
meantime, users can mitigate this vulnerability by using a load balancer or
other device to filter out malicious X_FORWARDED_HOST headers before they
reach the application.
Patches
To aid users who aren’t able to upgrade immediately we have provided patches for
the two supported release series. They are in git-am format and consist of a
single changeset.
- 6-1-Use-string-split-instead-of-regex-for-domain-parts.patch - Patch for 6.1 series
- 7-0-Use-string-split-instead-of-regex-for-domain-parts.patch - Patch for 7.0 series
Please note that only the 7.0.Z and 6.1.Z series are supported at present, and
6.0.Z for severe vulnerabilities. Users of earlier unsupported releases are
advised to upgrade as soon as possible as we cannot guarantee the continued
availability of security fixes for unsupported releases.
Credits
We would like to thank ooooooo_q for
reporting this
6-1-Use-string-split-instead-of-regex-for-domain-parts.patch (5.9 KB)
7-0-Use-string-split-instead-of-regex-for-domain-parts.patch (5.9 KB)