Description
ssh in OpenSSH before 10.1 allows control characters in usernames that originate from certain possibly untrusted sources, potentially leading to code execution when a ProxyCommand is used. The untrusted sources are the command line and %-sequence expansion of a configuration file. (A configuration file that provides a complete literal username is not categorized as an untrusted source.)
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
OpenBSD OpenSSH
Default version status: unaffected
0 to < 10.1affected
References
- https://www.openwall.com/lists/oss-security/2025/10/06/1 ↗
- https://marc.info/?l=openssh-unix-dev&m=175974522032149&w=2 ↗
- https://www.openssh.com/releasenotes.html#10.1p1 ↗
- https://dgl.cx/2025/10/bash-a-newline-ssh-proxycommand-cve-2025-61984 ↗
- http://www.openwall.com/lists/oss-security/2025/10/07/1 ↗
- http://www.openwall.com/lists/oss-security/2025/10/12/1 ↗
- https://www.vicarius.io/vsociety/posts/cve-2025-61984-detection-script-remote-code-execution-vulnerability-affecting-openssh ↗
- https://www.vicarius.io/vsociety/posts/cve-2025-61984-mitigation-script-remote-code-execution-vulnerability-affecting-openssh ↗
- https://cert-portal.siemens.com/productcert/html/ssa-019113.html ↗
- https://cert-portal.siemens.com/productcert/html/ssa-457936.html ↗