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Bug 1443381 - (CVE-2017-7468) CVE-2017-7468 curl: TLS session resumption client cert bypass
CVE-2017-7468 curl: TLS session resumption client cert bypass
Status: CLOSED NOTABUG
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
medium Severity medium
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Assigned To: Red Hat Product Security
impact=moderate,public=20170419,repor...
: Security
Depends On: 1443383 1443384
Blocks:
  Show dependency tree / graph
 
Reported: 2017-04-19 03:31 EDT by Andrej Nemec
Modified: 2018-01-11 07:37 EST (History)
28 users (show)

See Also:
Fixed In Version: curl 7.54.0
Doc Type: If docs needed, set a value
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Last Closed: 2017-04-19 03:32:56 EDT
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RHEL 7.3 requirements from Atomic Host:
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Description Andrej Nemec 2017-04-19 03:31:15 EDT 
libcurl would attempt to resume a TLS session even if the client certificate had changed. That is unacceptable since a server by specification is allowed to skip the client certificate check on resume, and may instead use the old identity which was established by the previous certificate (or no certificate).

libcurl supports by default the use of TLS session id/ticket to resume previous TLS sessions to speed up subsequent TLS handshakes. They are used when for any reason an existing TLS connection couldn't be kept alive to make the next handshake faster.

This flaw is a regression and identical to CVE-2016-5419 reported on August 3rd 2016, but affecting a different version range.

External References:

https://curl.haxx.se/docs/adv_20170419.html
Comment 1 Andrej Nemec 2017-04-19 03:32:06 EDT 
Created curl tracking bugs for this issue:

Affects: fedora-all [bug 1443384]


Created mingw-curl tracking bugs for this issue:

Affects: fedora-all [bug 1443383]
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