CVE-2020-14002

MEDIUM
New! CVE Severity Now Using CVSS v3

The calculated severity for CVEs has been updated to use CVSS v3 by default. CVEs that do not have a CVSS v3 score will fall back CVSS v2 for calculating severity. Severity display preferences can be toggled in the settings dropdown.

Description

PuTTY 0.68 through 0.73 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).

References

https://www.chiark.greenend.org.uk/~sgtatham/putty/changes.html

https://www.fzi.de/en/news/news/detail-en/artikel/fsa-2020-2-ausnutzung-eines-informationslecks-fuer-gezielte-mitm-angriffe-auf-ssh-clients/

https://lists.tartarus.org/pipermail/putty-announce/

https://lists.fedoraproject.org/archives/list/[email protected]/message/JPV4A77EDCT4BTFO5BE26ZH72BG4E5IJ/

https://lists.fedoraproject.org/archives/list/[email protected]/message/26TACCSQYYCPWAJYNAUIXJGZ5RGORJZV/

https://security.netapp.com/advisory/ntap-20200717-0003/

Details

Source: MITRE

Published: 2020-06-29

Updated: 2021-07-21

Type: CWE-200

Risk Information

CVSS v2

Base Score: 4.3

Vector: AV:N/AC:M/Au:N/C:P/I:N/A:N

Impact Score: 2.9

Exploitability Score: 8.6

Severity: MEDIUM

CVSS v3

Base Score: 5.9

Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

Impact Score: 3.6

Exploitability Score: 2.2

Severity: MEDIUM

Vulnerable Software

Configuration 1

OR

cpe:2.3:a:putty:putty:*:*:*:*:*:*:*:* versions from 0.68 to 0.73 (inclusive)

Tenable Plugins

View all (3 total)

IDNameProductFamilySeverity
138244Fedora 31 : putty (2020-f4dba093f1)NessusFedora Local Security Checks
medium
138235Fedora 32 : putty (2020-35442ce9b7)NessusFedora Local Security Checks
medium
137870FreeBSD : PuTTY -- Release 0.74 fixes two security vulnerabilities (6190c0cd-b945-11ea-9401-2dcf562daa69)NessusFreeBSD Local Security Checks
medium