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.
The product behaves differently or sends different responses under different circumstances in a way that is observable to an unauthorized actor, which exposes security-relevant information about the state of the product, such as whether a particular operation was successful or not.
| Link | Tags |
|---|---|
| https://github.com/openssh/openssh-portable/compare/V_8_3_P1...V_8_4_P1 | third party advisory patch |
| https://www.fzi.de/en/news/news/detail-en/artikel/fsa-2020-2-ausnutzung-eines-informationslecks-fuer-gezielte-mitm-angriffe-auf-ssh-clients/ | third party advisory |
| https://security.netapp.com/advisory/ntap-20200709-0004/ | third party advisory |
| http://www.openwall.com/lists/oss-security/2020/12/02/1 | patch mailing list third party advisory |
| https://anongit.mindrot.org/openssh.git/commit/?id=b3855ff053f5078ec3d3c653cdaedefaa5fc362d | third party advisory patch |
| https://docs.ssh-mitm.at/CVE-2020-14145.html | third party advisory |
| https://github.com/ssh-mitm/ssh-mitm/blob/master/ssh_proxy_server/plugins/session/cve202014145.py | third party advisory |
| https://security.gentoo.org/glsa/202105-35 | third party advisory vendor advisory |