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.
Fix
Patch, vendor advisory and mitigation references on NVD 4
- https://github.com/openssh/openssh-portable/commit/955854cafca88e0cdcd3d09ca1ad4ada465364a1 Patch, Third Party Advisory
- https://www.openssh.com/txt/release-8.3 Release Notes, Vendor Advisory
- https://github.com/openssh/openssh-portable/commit/955854cafca88e0cdcd3d09ca1ad4ada465364a1 Patch, Third Party Advisory
- https://www.openssh.com/txt/release-8.3 Release Notes, Vendor Advisory
Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.
Change history 1
- First seenCVSS 7.5 · openbsdNVD modified 2026-10-14 10:17
Affected (CPE criteria) 1
cpe:2.3:a:openbsd:openssh:8.2:*:*:*:*:*:*:*
References 9
- https://github.com/openssh/openssh-portable/commit/955854cafca88e0cdcd3d09ca1ad4ada465364a1 Patch, Third Party Advisory
- https://github.com/openssh/openssh-portable/commit/aad87b88fc2536b1ea023213729aaf4eaabe1894 Third Party Advisory
- https://www.openssh.com/txt/release-8.3 Release Notes, Vendor Advisory
- https://www.openwall.com/lists/oss-security/2020/05/27/1 Mailing List, Release Notes, Third Party Advisory
- https://github.com/openssh/openssh-portable/commit/955854cafca88e0cdcd3d09ca1ad4ada465364a1 Patch, Third Party Advisory
- https://github.com/openssh/openssh-portable/commit/aad87b88fc2536b1ea023213729aaf4eaabe1894 Third Party Advisory
- https://www.openssh.com/txt/release-8.3 Release Notes, Vendor Advisory
- https://www.openwall.com/lists/oss-security/2020/05/27/1 Mailing List, Release Notes, Third Party Advisory
- https://cert-portal.siemens.com/productcert/html/ssa-398330.html