CVE-2019-6111
CVSS v3
5.9
MEDIUM
EPSS Score
54.4 %
exploit probability
CISA KEV
No
known exploited
Exploitation
—
SSVC status
Description
An issue was discovered in OpenSSH 7.9. Due to the scp implementation being derived from 1983 rcp, the server chooses which files/directories are sent to the client. However, the scp client only performs cursory validation of the object name returned (only directory traversal attacks are prevented). A malicious scp server (or Man-in-The-Middle attacker) can overwrite arbitrary files in the scp client target directory. If recursive operation (-r) is performed, the server can manipulate subdirectories as well (for example, to overwrite the .ssh/authorized_keys file).
Frequently asked questions
What is CVE-2019-6111?
An issue was discovered in OpenSSH 7.9. Due to the scp implementation being derived from 1983 rcp, the server chooses which files/directories are sent to the client. However, the scp client only performs cursory validation of the object name returned (only directory traversal attacks are prevented). A malicious scp server (or Man-in-The-Middle attacker) can overwrite arbitrary files in the scp client target directory. If recursive operation (-r) is performed, the server can manipulate subdirectories as well (for example, to overwrite the .ssh/authorized_keys file).
Is CVE-2019-6111 actively exploited?
Active exploitation of CVE-2019-6111 has not been confirmed. The EPSS score is 54.4%, indicating the estimated probability of exploitation in the next 30 days.
What is the CVSS score for CVE-2019-6111?
CVE-2019-6111 has a CVSS v3 base score of 5.9 (MEDIUM severity).
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