CVE-2026-32147 (GCVE-0-2026-32147)

Vulnerability from cvelistv5 – Published: 2026-04-21 12:01 – Updated: 2026-07-24 14:14
VLAI
Title
SFTP chroot bypass via path traversal in SSH_FXP_FSETSTAT
Summary
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.
Severity
5.3 (Medium)
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
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-04-21 13:11 UTC
CWE
  • CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Assigner
EEF CNA under the mitre root
CNA scorecard A 97/100 over 341 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Erlang OTP Affected: 3.01 , < * (otp)
    cpe:2.3:a:erlang:erlang\/otp:*:*:*:*:*:*:*:*
Create a notification for this product.
Erlang OTP Affected: 17.0 , < * (otp)
Affected: 07b8f441ca711f9812fad9e9115bab3c3aa92f79 , < * (git)
    cpe:2.3:a:erlang:erlang\/otp:*:*:*:*:*:*:*:*
Create a notification for this product.
Credits
John Downey Michał Wąsowski Jakub Witczak
Show details on NVD website
To clipboard 

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            "value": "Improper Limitation of a Pathname to a Restricted Directory (\u0027Path Traversal\u0027) vulnerability in Erlang OTP ssh (ssh_sftpd module) allows an authenticated SFTP user to modify file attributes outside the configured chroot directory.\n\nThe 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.\n\nAny 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.\n\nIf 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.\n\nThis 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.\n\nThis issue affects OTP from OTP 17.0 before OTP\u00a028.4.3, OTP\u00a027.3.4.11 and OTP\u00a026.2.5.20, corresponding to ssh from 3.0.1 before 5.5.3, 5.2.11.7 and 5.1.4.15."
          },
          {
            "lang": "es",
            "value": "Una vulnerabilidad de Limitaci\u00f3n Incorrecta de un Nombre de Ruta a un Directorio Restringido (\u2019Salto de Ruta\u2019) en Erlang OTP ssh (m\u00f3dulo ssh_sftpd) permite a un usuario SFTP autenticado modificar atributos de archivo fuera del directorio chroot configurado.\n\nEl demonio SFTP (ssh_sftpd) almacena la ruta sin procesar, proporcionada por el usuario, en descriptores de archivo en lugar de la ruta resuelta por chroot. Cuando SSH_FXP_FSETSTAT se emite en dicho descriptor, los atributos de archivo (permisos, propiedad, marcas de tiempo) se modifican en la ruta real del sistema de archivos, eludiendo por completo el l\u00edmite del directorio ra\u00edz.\n\nCualquier usuario SFTP autenticado en un servidor configurado con la opci\u00f3n root puede modificar atributos de archivo de archivos fuera del l\u00edmite chroot previsto. El requisito previo es que un archivo de destino debe existir en el sistema de archivos real en la misma ruta relativa. Tenga en cuenta que esta vulnerabilidad solo permite la modificaci\u00f3n de atributos de archivo; el contenido de los archivos no puede ser le\u00eddo o alterado a trav\u00e9s de este vector de ataque.\n\nSi el demonio SSH se ejecuta como root, esto permite una escalada de privilegios directa: un atacante puede establecer el bit setuid en cualquier binario, cambiar la propiedad de archivos sensibles o hacer que la configuraci\u00f3n del sistema sea de escritura global.\n\nEsta vulnerabilidad est\u00e1 asociada con los archivos de programa lib/ssh/src/ssh_sftpd.erl y las rutinas de programa ssh_sftpd:do_open/4 y ssh_sftpd:handle_op/4.\n\nEste problema afecta a OTP desde OTP 17.0 hasta OTP 28.4.3, 27.3.4.11 y 26.2.5.20 correspondiente a ssh desde 3.01 hasta 5.5.3, 5.2.11.7 y 5.1.4.15."
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}



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Nomenclature

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  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

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