CVE-2021-22922 log

Severity Medium
Remote Yes
Type Insufficient validation
A security issue has been found in curl before version 7.78.0. When curl is instructed to download content using the metalink feature, the contents is verified against a hash provided in the metalink XML file. The metalink XML file points out to the client how to get the same content from a set of different URLs, potentially hosted by different servers and the client can then download the file from one or several of them in a serial or parallel manner.

If one of the servers hosting the contents has been breached and the contents of the specific file on that server is replaced with a modified payload, curl should detect this when the hash of the file mismatches after a completed download. It should remove the contents and instead try getting the contents from another URL. This is not done, and instead such a hash mismatch is only mentioned in text and the potentially malicious content is kept in the file on disk. There's a risk the user doesn't notice the message and instead assumes the file is fine.

This flaw exists only in the curl tool. libcurl is not affected.
Group Package Affected Fixed Severity Status Ticket
AVG-2194 curl 7.77.0-1 7.78.0-1 Medium Fixed
Date Advisory Group Package Severity Type
21 Jul 2021 ASA-202107-59 AVG-2194 curl Medium multiple issues

The issue can be mitigated by making sure not to use metalink with curl.