CVE-2020-12062

Description

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.

Weakness classification

• nvd@nist.gov: CWE-20

Primary references

• cve@mitre.org — Patch, Third Party Advisory
• cve@mitre.org — Third Party Advisory
• cve@mitre.org — Release Notes, Vendor Advisory
• cve@mitre.org — Mailing List, Release Notes, Third Party Advisory
• af854a3a-2127-422b-91ae-364da2661108 — Patch, Third Party Advisory
• af854a3a-2127-422b-91ae-364da2661108 — Third Party Advisory
• af854a3a-2127-422b-91ae-364da2661108 — Release Notes, Vendor Advisory
• af854a3a-2127-422b-91ae-364da2661108 — Mailing List, Release Notes, Third Party Advisory
• 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e