CVE-2020-12062

Published: 01 June 2020

** DISPUTED ** The scp client in OpenSSH 8.2 incorrectly sends duplicate responses to the server upon a utimes system call failure, which allows a malicious unprivileged user on the remote server to overwrite arbitrary files in the client's download directory by creating a crafted subdirectory anywhere on the remote server. The victim must use the command scp -rp to download a file hierarchy containing, anywhere inside, this crafted subdirectory. NOTE: the vendor points out that "this attack can achieve no more than a hostile peer is already able to achieve within the scp protocol" and "utimes does not fail under normal circumstances."

Priority

Negligible

CVSS 3 base score: 7.5

Status

Package Release Status
openssh
Launchpad, Ubuntu, Debian
Upstream Needs triage

Ubuntu 20.04 LTS (Focal Fossa) Ignored

Ubuntu 18.04 LTS (Bionic Beaver) Ignored

Ubuntu 16.04 ESM (Xenial Xerus) Ignored

Ubuntu 14.04 ESM (Trusty Tahr) Ignored

Patches:
Upstream: https://github.com/openssh/openssh-portable/commit/955854cafca88e0cdcd3d09ca1ad4ada465364a1
Upstream: https://github.com/openssh/openssh-portable/commit/aad87b88fc2536b1ea023213729aaf4eaabe1894
openssh-ssh1
Launchpad, Ubuntu, Debian
Upstream Ignored
(frozen on openssh 7.5p)
Ubuntu 20.04 LTS (Focal Fossa) Ignored

Ubuntu 18.04 LTS (Bionic Beaver) Ignored

Ubuntu 16.04 ESM (Xenial Xerus) Does not exist

Ubuntu 14.04 ESM (Trusty Tahr) Does not exist

Notes

AuthorNote
seth-arnold
openssh-ssh1 is provided for compatibility with old devices that
cannot be upgraded to modern protocols. Thus we may not provide security
support for this package if doing so would prevent access to equipment.
mdeslaur
this issue has been disputed as being a security issue, we will
not be fixing this issue in Ubuntu.

References