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CVE-2020-14145

Date: June 29, 2020

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.

Language: C

Severity Score

Related Resources (14)

https://security.alpinelinux.org/vuln/CVE-2020-14145
https://security.netapp.com/advisory/ntap-20200709-0004/
https://security.gentoo.org/glsa/202105-35
http://www.openwall.com/lists/oss-security/2020/12/02/1
https://access.redhat.com/security/cve/CVE-2020-14145
https://people.canonical.com/~ubuntu-security/cve/CVE-2020-14145
https://anongit.mindrot.org/openssh.git/commit/?id=b3855ff053f5078ec3d3c653cdaedefaa5fc362d
https://nvd.nist.gov/vuln/detail/CVE-2020-14145
https://security-tracker.debian.org/tracker/CVE-2020-14145
https://github.com/openssh/openssh-portable/compare/V_8_3_P1...V_8_4_P1
https://www.fzi.de/en/news/news/detail-en/artikel/fsa-2020-2-ausnutzung-eines-informationslecks-fuer-gezielte-mitm-angriffe-auf-ssh-clients/
https://docs.ssh-mitm.at/CVE-2020-14145.html
https://github.com/ssh-mitm/ssh-mitm/blob/master/ssh_proxy_server/plugins/session/cve202014145.py
https://www.mend.io/vulnerability-database/CVE-2020-14145

Severity Score

Weakness Type (CWE)

Information Leak / Disclosure

CWE-200

Observable Discrepancy

CWE-203

CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): HIGH
Privileges Required (PR): NONE
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): HIGH
Integrity (I): NONE
Availability (A): NONE

CVSS v2

Base Score:
Access Vector (AV): NETWORK
Access Complexity (AC): MEDIUM
Authentication (AU): NONE
Confidentiality (C): PARTIAL
Integrity (I): NONE
Availability (A): NONE
Additional information:

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