Bug 1443381 (CVE-2017-7468) - CVE-2017-7468 curl: TLS session resumption client cert bypass
Summary: CVE-2017-7468 curl: TLS session resumption client cert bypass
Alias: CVE-2017-7468
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
Depends On: 1443383 1443384
TreeView+ depends on / blocked
Reported: 2017-04-19 07:31 UTC by Andrej Nemec
Modified: 2021-02-17 02:16 UTC (History)
30 users (show)

Fixed In Version: curl 7.54.0
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Clone Of:
Last Closed: 2017-04-19 07:32:56 UTC

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Description Andrej Nemec 2017-04-19 07:31:15 UTC
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:


Comment 1 Andrej Nemec 2017-04-19 07:32:06 UTC
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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