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prionPRIOn knowledge basePRION:CVE-2021-22922
HistoryAug 05, 2021 - 9:15 p.m.

Design/Logic Flaw

2021-08-0521:15:00
PRIOn knowledge base
www.prio-n.com
10

AI Score

6.8

Confidence

High

EPSS

0.004

Percentile

72.1%

When curl is instructed to download content using the metalink feature, thecontents 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 contentfrom a set of different URLs, potentially hosted by different servers and theclient can then download the file from one or several of them. In a serial orparallel manner.If one of the servers hosting the contents has been breached and the contentsof the specific file on that server is replaced with a modified payload, curlshould detect this when the hash of the file mismatches after a completeddownload. It should remove the contents and instead try getting the contentsfrom another URL. This is not done, and instead such a hash mismatch is onlymentioned in text and the potentially malicious content is kept in the file ondisk.