FTP PASV SSRF, ftpcp() does not use actual peer address, trusts server-supplied PASV host address
The ftpcp() function in Lib/ftplib.py was not updated when CVE-2021-4189 was fixed. While makepasv() was patched to replace server-supplied PASV host addresses with the actual peer address (getpeername()[0]), ftpcp() still calls parse227() directly and passes the raw attacker-controllable IP address and port to target.sendport(). This patch is related to CVE-2021-4189.
01
beschreibt (1)
Zugehörige CVEs.
| ID | Schweregrad | ausnutzbar | ||
|---|---|---|---|---|
| CVE-2026-8328US | — | — | ||
The ftpcp() function in Lib/ftplib.py was not updated when
CVE-2021-4189 was fixed. While makepasv() was patched to replace
server-supplied PASV host addresses with the actual pe… | ||||
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Referenzen
Externe Belege — Patches, Meldungen, Analysen.
- https://github.com/python/cpython/commit/2bbcf3fb7a420a05605576c0f9468d4675381b5fWEB
- https://github.com/python/cpython/commit/5dadc64673ce875ebfb24163907777dae0f6ca06WEB
- https://github.com/python/cpython/commit/7d95a1dc7382b55cba7fdd6a110336077584a4f0WEB
- https://github.com/python/cpython/commit/bb3446dda6c49b32e67c11dbbbf221b40be00763WEB
- https://github.com/python/cpython/commit/c88704431ea3248ca769384c13856330976fac1dWEB
- https://github.com/python/cpython/commit/eac4fe3b2c77693790a5ef7dfab127c1fee81bf9WEB
- https://github.com/python/cpython/commit/ef12d0dc824baccf737bba1458e5eed3d1e0fcebWEB
- https://github.com/python/cpython/issues/87451WEB
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