QID 671008

curl is a command line tool for transferring data with URL syntax, supporting FTP, FTPS, HTTP, HTTPS, SCP, SFTP, TFTP, TELNET, DICT, LDAP, LDAPS, FILE, IMAP, SMTP, POP3 and RTSP. curl supports SSL certificates, HTTP POST, HTTP PUT, FTP uploading, HTTP form based upload, proxies, cookies, user+password authentication (Basic, Digest, NTLM, Negotiate, kerberos...), file transfer resume, proxy tunneling and a busload of other useful tricks. Security Fix(es): 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, curlshould 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 ondisk.(CVE-2021-22922)

An arbitrary attacker may exploit this vulnerability to compromise the system.