Vulnerability Details CVE-2020-12062
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.005
EPSS Ranking 66.8%
CVSS Severity
CVSS v3 Score 7.5
CVSS v2 Score 5.0
References
- https://github.com/openssh/openssh-portable/commit/955854cafca88e0cdcd3d09ca1ad4ada465364a1
- https://github.com/openssh/openssh-portable/commit/aad87b88fc2536b1ea023213729aaf4eaabe1894
- https://www.openssh.com/txt/release-8.3
- https://www.openwall.com/lists/oss-security/2020/05/27/1
- https://github.com/openssh/openssh-portable/commit/955854cafca88e0cdcd3d09ca1ad4ada465364a1
- https://github.com/openssh/openssh-portable/commit/aad87b88fc2536b1ea023213729aaf4eaabe1894
- https://www.openssh.com/txt/release-8.3
- https://www.openwall.com/lists/oss-security/2020/05/27/1