Bug 1852415 (CVE-2020-14002) - CVE-2020-14002 putty: Observable Discrepancy leading to an information leak in the algorithm negotiation
Summary: CVE-2020-14002 putty: Observable Discrepancy leading to an information leak i...
Keywords:
Status: CLOSED UPSTREAM
Alias: CVE-2020-14002
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
low
low
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1852416 1852417 1852418
Blocks:
TreeView+ depends on / blocked
 
Reported: 2020-06-30 11:29 UTC by Michael Kaplan
Modified: 2020-06-30 17:20 UTC (History)
5 users (show)

Fixed In Version: putty 0.74
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Environment:
Last Closed: 2020-06-30 17:20:41 UTC
Embargoed:

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Description Michael Kaplan 2020-06-30 11:29:34 UTC 
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://lists.tartarus.org/pipermail/putty-announce/
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/
Comment 1 Michael Kaplan 2020-06-30 11:30:12 UTC 
Created putty tracking bugs for this issue:

Affects: epel-6 [bug 1852417]
Affects: epel-7 [bug 1852418]
Affects: fedora-all [bug 1852416]
Comment 2 Product Security DevOps Team 2020-06-30 17:20:41 UTC 
This CVE Bugzilla entry is for community support informational purposes only as it does not affect a package in a commercially supported Red Hat product. Refer to the dependent bugs for status of those individual community products.
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