CVE-2019-6111
MEDIUM severity · CVSS 5.9 · Path traversal
5.9CVSS MEDIUM
Summary
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).
Impact & exploitability
Attack vectorNetwork
Attack complexityHigh
Privileges requiredNone
User interactionNone
Confidentiality impactNone
Integrity impactHigh
Availability impactNone
Exploit probability (EPSS)58%
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
Affected products we track (1)
Recommendation
Apply the vendor fix in your normal patch cycle. Open any affected product above for its exact safe version.
Additional information
- NVD record
- http://lists.opensuse.org/opensuse-security-announce/2019-06/msg00058.html
- http://www.openwall.com/lists/oss-security/2019/04/18/1Advisory
- http://www.openwall.com/lists/oss-security/2022/08/02/1Advisory
- http://www.securityfocus.com/bid/106741Advisory
- https://access.redhat.com/errata/RHSA-2019:3702Advisory
- https://cert-portal.siemens.com/productcert/pdf/ssa-412672.pdfAdvisory
- https://cvsweb.openbsd.org/src/usr.bin/ssh/scp.c
- https://bugzilla.redhat.com/show_bug.cgi?id=1677794Advisory