Public Date:
1213306: CVE-2015-3143 curl: re-using authenticated connection when unauthenticated
It was discovered that libcurl could incorrectly reuse NTLM-authenticated connections for subsequent unauthenticated requests to the same host. If an application using libcurl established an NTLM-authenticated connection to a server, and sent subsequent unauthenticated requests to the same server, the unauthenticated requests could be sent over the NTLM-authenticated connection, appearing as if they were sent by the NTLM authenticated user.

Find out more about CVE-2015-3143 from the MITRE CVE dictionary dictionary and NIST NVD.


This issue affects the version of curl package as shipped with Red Hat Enterprise Linux 5. Red Hat Enterprise Linux 5 is now in Production 3 Phase of the support and maintenance life cycle. This issue is not planned to be addressed in a future update for Red Hat Enterprise Linux 5.

CVSS v2 metrics

Base Score 4
Base Metrics AV:N/AC:H/Au:N/C:P/I:P/A:N
Access Vector Network
Access Complexity High
Authentication None
Confidentiality Impact Partial
Integrity Impact Partial
Availability Impact None

Find out more about Red Hat support for the Common Vulnerability Scoring System (CVSS).

Red Hat Security Errata

Platform Errata Release Date
Red Hat Enterprise Linux 7 (curl) RHSA-2015:2159 2015-11-19
Red Hat Enterprise Linux 6 (curl) RHSA-2015:1254 2015-07-20

Affected Packages State

Platform Package State
Red Hat Enterprise Linux 5 curl Will not fix
Red Hat Ceph Storage 1.2 curl Will not fix
RHEV Manager 3 mingw-virt-viewer Fix deferred
Unless explicitly stated as not affected, all previous versions of packages in any minor update stream of a product listed here should be assumed vulnerable, although may not have been subject to full analysis.


Red Hat would like to thank Daniel Stenberg (curl upstream) for reporting this issue. Upstream acknowledges Paras Sethia as the original reporter.

External References

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