CVE-2026-88017rclone: FTP cross-session auth-proxy backend confusion

Beschreibung

rclone is a command-line program to sync files and directories to and from different cloud storage providers. From 1.64.0 until 1.75.1, the FTP auth-proxy driver in cmd/serve/ftp/ftp.go stores one obscured password per username in the server-wide userPass map[string]string instead of binding the credential or VFS to the authenticated session. If two accepted credentials use the same username but resolve to different proxy backends, a later CheckPasswd login overwrites userPass[user], and subsequent getVFS operations on the first session are reauthorized with the later password. The first session can then read, create, overwrite, rename, or delete objects using the second credential’s backend authority. Exploitation requires the later same-username login to occur while the first session remains open. This issue is fixed in version 1.75.1.

Daten: CVE.org, NVD, CISA KEV, FIRST EPSS, Ubuntu. Wiedergegeben wie in der Quelle, auf Englisch.

Betroffene Produkte und Versionen

Referenzen und Patches

• https://github.com/rclone/rclone/security/advisories/GHSA-c476-6w5q-jw77 Vendor Advisory
• https://github.com/rclone/rclone/commit/c6af0b57c2b4af848bc968c2b407354476184b99 Patch
• https://github.com/rclone/rclone/releases/tag/v1.75.1 Release Notes