CVE-2020-14145

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.

Affected Software

Weaknesses

• n/a

ADP Enrichment

CVE Program Container

Additional References

• 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://security.netapp.com/advisory/ntap-20200709-0004/
• http://www.openwall.com/lists/oss-security/2020/12/02/1
• https://anongit.mindrot.org/openssh.git/commit/?id=b3855ff053f5078ec3d3c653cdaedefaa5fc362d
• 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://security.gentoo.org/glsa/202105-35

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: no
  • Technical Impact: partial

References

• 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://security.netapp.com/advisory/ntap-20200709-0004/
• http://www.openwall.com/lists/oss-security/2020/12/02/1
• https://anongit.mindrot.org/openssh.git/commit/?id=b3855ff053f5078ec3d3c653cdaedefaa5fc362d
• 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://security.gentoo.org/glsa/202105-35

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