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Bug 615994 (CVE-2017-7468)

Summary: <net-misc/curl-7.54.0: TLS session resumption client cert bypass (again)
Product: Gentoo Security Reporter: Jeroen Roovers (RETIRED) <jer>
Component: VulnerabilitiesAssignee: Gentoo Security <security>
Severity: minor CC: arthur, blueness
Priority: Normal    
Version: unspecified   
Hardware: All   
OS: Linux   
Whiteboard: A4 [glsa cve]
Package list:
Runtime testing required: ---
Bug Depends on: 626776    
Bug Blocks:    

Description Jeroen Roovers (RETIRED) gentoo-dev 2017-04-19 08:02:17 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.

We are not aware of any exploit of this flaw.
Comment 1 GLSAMaker/CVETool Bot gentoo-dev 2017-09-17 21:18:42 UTC
This issue was resolved and addressed in
 GLSA 201709-14 at
by GLSA coordinator Aaron Bauman (b-man).