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Advisories

vsftpd through 3.0.5 cmds_denied Bypass via RFC 775 Command Aliases

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Severity
low
Date
Affecting

  • vsftpd <= 3.0.5

CWE
  • CWE-184 Incomplete List of Disallowed Inputs
CVSS
2.3
CVSS V4 Vector
CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
Credit
Abraxas Labs
Description
vsftpd through 3.0.5 contains an access control bypass vulnerability that allows authenticated FTP users to execute denied commands by issuing RFC 775 X-prefixed aliases. The cmds_denied check in process_post_login() compares literal tokens, so attackers can send XRMD, XMKD, XCWD, XPWD, or XCUP to perform blocked operations like deleting directories.

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