// For flags

CVE-2016-5420

curl: Re-using connection with wrong client cert

Severity Score

7.5
*CVSS v3

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

-
*SSVC
Descriptions

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.

curl y libcurl en versiones anteriores a 7.50.1 no verifica el certificado de cliente cuando se está escogiendo la conexión TLS para reutilizar, lo que podría permitir a atacantes remotos secuestrar la autenticación de la conexión aprovechando una conexión previamente creada con un certificado de cliente diferente.

It was found that the libcurl library did not check the client certificate when choosing the TLS connection to reuse. An attacker could potentially use this flaw to hijack the authentication of the connection by leveraging a previously created connection with a different client certificate.

*Credits: N/A
CVSS Scores
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
None
Attack Vector
Network
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
None
Attack Vector
Network
Attack Complexity
Low
Authentication
None
Confidentiality
None
Integrity
Partial
Availability
None
Attack Vector
Network
Attack Complexity
Medium
Authentication
Single
Confidentiality
Partial
Integrity
Partial
Availability
None
* Common Vulnerability Scoring System
SSVC
  • Decision:-
Exploitation
-
Automatable
-
Tech. Impact
-
* Organization's Worst-case Scenario
Timeline
  • 2016-06-10 CVE Reserved
  • 2016-08-03 CVE Published
  • 2023-03-07 EPSS Updated
  • 2024-08-06 CVE Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-285: Improper Authorization
  • CWE-295: Improper Certificate Validation
CAPEC
References (20)
URL Tag Source
http://www.oracle.com/technetwork/security-advisory/cpuoct2018-4428296.html X_refsource_confirm
http://www.securityfocus.com/bid/92309 Vdb Entry
http://www.securitytracker.com/id/1036537 Vdb Entry
http://www.securitytracker.com/id/1036739 Vdb Entry
https://source.android.com/security/bulletin/2016-12-01.html X_refsource_confirm
https://www.tenable.com/security/tns-2016-18 X_refsource_confirm
URL Date SRC
URL Date SRC
https://curl.haxx.se/docs/adv_20160803B.html 2023-11-07
URL Date SRC
http://lists.opensuse.org/opensuse-updates/2016-09/msg00011.html 2023-11-07
http://lists.opensuse.org/opensuse-updates/2016-09/msg00094.html 2023-11-07
http://rhn.redhat.com/errata/RHSA-2016-2575.html 2023-11-07
http://rhn.redhat.com/errata/RHSA-2016-2957.html 2023-11-07
http://www.debian.org/security/2016/dsa-3638 2023-11-07
http://www.slackware.com/security/viewer.php?l=slackware-security&y=2016&m=slackware-security.563059 2023-11-07
http://www.ubuntu.com/usn/USN-3048-1 2023-11-07
https://access.redhat.com/errata/RHSA-2018:3558 2023-11-07
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GLPXQQKURBQFM4XM6645VRPTOE2AWG33 2023-11-07
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/K3GQH4V3XAQ5Z53AMQRDEC3C3UHTW7QR 2023-11-07
https://security.gentoo.org/glsa/201701-47 2023-11-07
https://access.redhat.com/security/cve/CVE-2016-5420 2018-11-13
https://bugzilla.redhat.com/show_bug.cgi?id=1362190 2018-11-13
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Debian
Search vendor "Debian"
 Debian Linux
Search vendor "Debian" for product "Debian Linux"
 8.0
Search vendor "Debian" for product "Debian Linux" and version "8.0"
-
Affected
Haxx
Search vendor "Haxx"
 Libcurl
Search vendor "Haxx" for product "Libcurl"
 <= 7.50.0
Search vendor "Haxx" for product "Libcurl" and version " <= 7.50.0"
-
Affected
Opensuse
Search vendor "Opensuse"
 Leap
Search vendor "Opensuse" for product "Leap"
 42.1
Search vendor "Opensuse" for product "Leap" and version "42.1"
-
Affected