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CVE-2016-5420

Published: 3 August 2016

curl and libcurl before 7.50.1 do not check the client certificate when choosing the TLS connection to reuse, which might allow remote attackers to hijack the authentication of the connection by leveraging a previously created connection with a different client certificate.

Notes

AuthorNote
seth-arnold
when built against NSS another patch is needed, see
http://www.openwall.com/lists/oss-security/2016/09/05/1 for information
http://www.openwall.com/lists/oss-security/2016/09/05/7

Priority

Medium

Cvss 3 Severity Score

7.5

Score breakdown

Status

Package Release Status
curl
Launchpad, Ubuntu, Debian
precise
Released (7.22.0-3ubuntu4.16)
trusty
Released (7.35.0-1ubuntu2.8)
upstream
Released (7.50.1-1)
xenial
Released (7.47.0-1ubuntu2.1)
yakkety Not vulnerable
(7.50.1-1ubuntu1)
zesty Not vulnerable
(7.50.1-1ubuntu1)
Patches:
upstream: https://curl.haxx.se/CVE-2016-5420.patch

Severity score breakdown

Parameter Value
Base score 7.5
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality None
Integrity impact High
Availability impact None
Vector CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N