Rack has possible DoS Vulnerability in Multipart MIME parsing
High severity
GitHub Reviewed
Published
Mar 8, 2023
to the GitHub Advisory Database
•
Updated Dec 17, 2023
Package
Affected versions
< 2.0.9.3
>= 2.1.0, < 2.1.4.3
>= 2.2.0, < 2.2.6.3
>= 3.0.0, < 3.0.4.2
Patched versions
2.0.9.3
2.1.4.3
2.2.6.3
3.0.4.2
Description
Published to the GitHub Advisory Database
Mar 8, 2023
Reviewed
Mar 8, 2023
Published by the National Vulnerability Database
Mar 10, 2023
Last updated
Dec 17, 2023
There is a possible DoS vulnerability in the Multipart MIME parsing code in Rack. This vulnerability has been assigned the CVE identifier CVE-2023-27530.
Versions Affected: All. Not affected: None Fixed Versions: 3.0.4.2, 2.2.6.3, 2.1.4.3, 2.0.9.3
Impact
The Multipart MIME parsing code in Rack limits the number of file parts, but does not limit the total number of parts that can be uploaded. Carefully crafted requests can abuse this and cause multipart parsing to take longer than expected.
All users running an affected release should either upgrade or use one of the workarounds immediately.
Workarounds
A proxy can be configured to limit the POST body size which will mitigate this issue.
References