CVE-2026-32147
Publication date 21 April 2026
Last updated 8 October 2026
Ubuntu priority
Description
Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') vulnerability in Erlang OTP ssh (ssh_sftpd module) allows an authenticated SFTP user to modify file attributes outside the configured chroot directory. The SFTP daemon (ssh_sftpd) stores the raw, user-supplied path in file handles instead of the chroot-resolved path. When SSH_FXP_FSETSTAT is issued on such a handle, file attributes (permissions, ownership, timestamps) are modified on the real filesystem path, bypassing the root directory boundary entirely. Any authenticated SFTP user on a server configured with the root option can modify file attributes of files outside the intended chroot boundary. The prerequisite is that a target file must exist on the real filesystem at the same relative path. Note that this vulnerability only allows modification of file attributes; file contents cannot be read or altered through this attack vector. If the SSH daemon runs as root, this enables direct privilege escalation: an attacker can set the setuid bit on any binary, change ownership of sensitive files, or make system configuration world-writable. This vulnerability is associated with program files lib/ssh/src/ssh_sftpd.erl and program routines ssh_sftpd:do_open/4 and ssh_sftpd:handle_op/4. This issue affects OTP from OTP 17.0 before OTP 28.4.3, OTP 27.3.4.11 and OTP 26.2.5.20, corresponding to ssh from 3.0.1 before 5.5.3, 5.2.11.7 and 5.1.4.15.
Status
| Package | Ubuntu Release | Status |
|---|---|---|
| erlang | 26.04 LTS resolute |
Fixed 1:27.3.4.6+dfsg-1ubuntu0.2
|
| 24.04 LTS noble |
Fixed 1:25.3.2.8+dfsg-1ubuntu4.8
|
|
| 22.04 LTS jammy |
Fixed 1:24.2.1+dfsg-1ubuntu0.8
|
|
| 20.04 LTS focal |
Fixed 1:22.2.7+dfsg-1ubuntu0.5+esm3
|
|
| 18.04 LTS bionic |
Fixed 1:20.2.2+dfsg-1ubuntu2+esm4
|
|
| 16.04 LTS xenial |
Fixed 1:18.3-dfsg-1ubuntu3.1+esm4
|
|
| 14.04 LTS trusty |
Fixed 1:16.b.3-dfsg-1ubuntu2.2+esm3
|
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CVSS version:
Base score
5.3 · Medium
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:L/SA:N
Base score
4.3 · Medium
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N