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Improper Neutralization of CRLF Sequences ('CRLF Injection') in basic-ftp

Cxd1b70372-eae2

  • basic-ftp
High
8.2/10

Summary

basic-ftp's CRLF injection protection (added in commit 2ecc8e2 for GHSA-chqc-8p9q-pq6q) is incomplete. Two code paths bypass the `protectWhitespace()` control character check: (1) the `login()` method directly concatenates user-supplied credentials into USER/PASS FTP commands without any validation, and (2) the `_openDir()` method sends an MKD command before `cd()` invokes `protectWhitespace()`, creating a TOCTOU bypass. Both vectors allow an attacker who controls input to inject arbitrary FTP commands into the control connection. The affected versions are prior to 5.2.2.

  • LOW
  • NETWORK
  • HIGH
  • UNCHANGED
  • NONE
  • NONE
  • NONE
  • LOW

CWE-93 - Improper Neutralization of CRLF Sequences ('CRLF Injection')

The software uses CRLF (carriage return line feeds) as a special element, e.g. to separate lines or records, but it does not neutralize or incorrectly neutralizes CRLF sequences from inputs.

References

Advisory Timeline

  • Published