CVE-2020-14145
MEDIUM severity · CVSS 5.9 · CWE-203
5.9CVSS MEDIUM
Summary
The client side in OpenSSH 5.7 through 8.4 has an Observable Discrepancy leading to an information leak in the algorithm negotiation. This allows man-in-the-middle attackers to target initial connection attempts (where no host key for the server has been cached by the client). NOTE: some reports state that 8.5 and 8.6 are also affected.
Impact & exploitability
Attack vectorNetwork
Attack complexityHigh
Privileges requiredNone
User interactionNone
Confidentiality impactHigh
Integrity impactNone
Availability impactNone
Exploit probability (EPSS)2%
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/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.
Official patch: http://www.openwall.com/lists/oss-security/2020/12/02/1 ↗
Additional information
- NVD record
- http://www.openwall.com/lists/oss-security/2020/12/02/1Patch
- https://anongit.mindrot.org/openssh.git/commit/?id=b3855ff053f5078ec3d3c653cdaedefaa5fc362dPatch
- https://github.com/openssh/openssh-portable/compare/V_8_3_P1...V_8_4_P1Patch
- https://docs.ssh-mitm.at/CVE-2020-14145.htmlAdvisory
- https://github.com/ssh-mitm/ssh-mitm/blob/master/ssh_proxy_server/plugins/session/cve202014145.pyAdvisory
- https://security.gentoo.org/glsa/202105-35Advisory
- https://security.netapp.com/advisory/ntap-20200709-0004/Advisory
- https://www.fzi.de/en/news/news/detail-en/artikel/fsa-2020-2-ausnutzung-eines-informationslecks-fuer-gezielte-mitm-angriffe-auf-ssh-clients/Advisory