CVEs-PoC/2021/CVE-2021-22922.md

CVE-2021-22922

Description

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.

POC

Reference

• https://www.oracle.com/security-alerts/cpuoct2021.html

Github

• https://github.com/ARPSyndicate/cvemon
• https://github.com/Sudrien/metalink4-ruby
• https://github.com/Thaeimos/aws-eks-image
• https://github.com/kenlavbah/log4jnotes
• https://github.com/n0-traces/cve_monitor