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Category:   Application (Generic)  >   curl Vendors:   curl.haxx.se
(Red Hat Issues Fix) cURL/libcurl Certificate Reuse Bug Lets Remote Users Bypass Security Restrictions on the Target System
SecurityTracker Alert ID:  1037195
SecurityTracker URL:  http://securitytracker.com/id/1037195
CVE Reference:   CVE-2016-5420, CVE-2016-7141   (Links to External Site)
Date:  Nov 4 2016
Impact:   Disclosure of system information, Disclosure of user information, Modification of system information, Modification of user information
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 7.19.6 through 7.50.1
Description:   A vulnerability was reported in cURL. A remote user can bypass security controls on the target system.

The library may reuse a client certificate from file on a subsequent TLS connection is no certificate is set for the subsequent connection.

Systems with libcurl built on top of Network Security Services (NSS) and with the 'libnsspem.so' library available at runtime is affected.

The command line tool is also affected.

Red Hat Security reported this vulnerability.

Impact:   A remote user may be able to bypass security controls on the target system.
Solution:   Red Hat has issued a fix.

The Red Hat advisory is available at:

https://rhn.redhat.com/errata/RHSA-2016-2575.html

Vendor URL:  rhn.redhat.com/errata/RHSA-2016-2575.html (Links to External Site)
Cause:   Access control error
Underlying OS:  Linux (Red Hat Enterprise)
Underlying OS Comments:  7

Message History:   This archive entry is a follow-up to the message listed below.
Sep 7 2016 cURL/libcurl Certificate Reuse Bug Lets Remote Users Bypass Security Restrictions on the Target System



 Source Message Contents

Subject:  [RHSA-2016:2575-02] Moderate: curl security, bug fix, and enhancement update

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=====================================================================
                   Red Hat Security Advisory

Synopsis:          Moderate: curl security, bug fix, and enhancement update
Advisory ID:       RHSA-2016:2575-02
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2016-2575.html
Issue date:        2016-11-03
CVE Names:         CVE-2016-5419 CVE-2016-5420 CVE-2016-7141 
=====================================================================

1. Summary:

An update for curl is now available for Red Hat Enterprise Linux 7.

Red Hat Product Security has rated this update as having a security impact
of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which
gives a detailed severity rating, is available for each vulnerability from
the CVE link(s) in the References section.

2. Relevant releases/architectures:

Red Hat Enterprise Linux Client (v. 7) - x86_64
Red Hat Enterprise Linux Client Optional (v. 7) - x86_64
Red Hat Enterprise Linux ComputeNode (v. 7) - x86_64
Red Hat Enterprise Linux ComputeNode Optional (v. 7) - x86_64
Red Hat Enterprise Linux Server (v. 7) - aarch64, ppc64, ppc64le, s390x, x86_64
Red Hat Enterprise Linux Workstation (v. 7) - x86_64

3. Description:

The curl packages provide the libcurl library and the curl utility for
downloading files from servers using various protocols, including HTTP,
FTP, and LDAP.

Security Fix(es):

* It was found that the libcurl library did not prevent TLS session
resumption when the client certificate had changed. 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. (CVE-2016-5419)

* 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. (CVE-2016-5420)

* It was found that the libcurl library using the NSS (Network Security
Services) library as TLS/SSL backend incorrectly re-used client
certificates for subsequent TLS connections in certain cases. 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. (CVE-2016-7141)

Additional Changes:

For detailed information on changes in this release, see the Red Hat
Enterprise Linux 7.3 Release Notes linked from the References section.

4. Solution:

For details on how to apply this update, which includes the changes
described in this advisory, refer to:

https://access.redhat.com/articles/11258

5. Bugs fixed (https://bugzilla.redhat.com/):

1260178 - curl and libcurl truncates username/password in URL to 255 characters
1269855 - Certificate verification fails with multiple https urls [el7/curl]
1275769 - curl requires public ssh key file [RHEL-7]
1305974 - --disable-epsv option ignored for IPv6 hosts
1347904 - Ceph RGW deadlocks in curl_multi_wait
1362183 - CVE-2016-5419 curl: TLS session resumption client cert bypass
1362190 - CVE-2016-5420 curl: Re-using connection with wrong client cert
1373229 - CVE-2016-7141 curl: Incorrect reuse of client certificates

6. Package List:

Red Hat Enterprise Linux Client (v. 7):

Source:
curl-7.29.0-35.el7.src.rpm

x86_64:
curl-7.29.0-35.el7.x86_64.rpm
curl-debuginfo-7.29.0-35.el7.i686.rpm
curl-debuginfo-7.29.0-35.el7.x86_64.rpm
libcurl-7.29.0-35.el7.i686.rpm
libcurl-7.29.0-35.el7.x86_64.rpm

Red Hat Enterprise Linux Client Optional (v. 7):

x86_64:
curl-debuginfo-7.29.0-35.el7.i686.rpm
curl-debuginfo-7.29.0-35.el7.x86_64.rpm
libcurl-devel-7.29.0-35.el7.i686.rpm
libcurl-devel-7.29.0-35.el7.x86_64.rpm

Red Hat Enterprise Linux ComputeNode (v. 7):

Source:
curl-7.29.0-35.el7.src.rpm

x86_64:
curl-7.29.0-35.el7.x86_64.rpm
curl-debuginfo-7.29.0-35.el7.i686.rpm
curl-debuginfo-7.29.0-35.el7.x86_64.rpm
libcurl-7.29.0-35.el7.i686.rpm
libcurl-7.29.0-35.el7.x86_64.rpm

Red Hat Enterprise Linux ComputeNode Optional (v. 7):

x86_64:
curl-debuginfo-7.29.0-35.el7.i686.rpm
curl-debuginfo-7.29.0-35.el7.x86_64.rpm
libcurl-devel-7.29.0-35.el7.i686.rpm
libcurl-devel-7.29.0-35.el7.x86_64.rpm

Red Hat Enterprise Linux Server (v. 7):

Source:
curl-7.29.0-35.el7.src.rpm

aarch64:
curl-7.29.0-35.el7.aarch64.rpm
curl-debuginfo-7.29.0-35.el7.aarch64.rpm
libcurl-7.29.0-35.el7.aarch64.rpm
libcurl-devel-7.29.0-35.el7.aarch64.rpm

ppc64:
curl-7.29.0-35.el7.ppc64.rpm
curl-debuginfo-7.29.0-35.el7.ppc.rpm
curl-debuginfo-7.29.0-35.el7.ppc64.rpm
libcurl-7.29.0-35.el7.ppc.rpm
libcurl-7.29.0-35.el7.ppc64.rpm
libcurl-devel-7.29.0-35.el7.ppc.rpm
libcurl-devel-7.29.0-35.el7.ppc64.rpm

ppc64le:
curl-7.29.0-35.el7.ppc64le.rpm
curl-debuginfo-7.29.0-35.el7.ppc64le.rpm
libcurl-7.29.0-35.el7.ppc64le.rpm
libcurl-devel-7.29.0-35.el7.ppc64le.rpm

s390x:
curl-7.29.0-35.el7.s390x.rpm
curl-debuginfo-7.29.0-35.el7.s390.rpm
curl-debuginfo-7.29.0-35.el7.s390x.rpm
libcurl-7.29.0-35.el7.s390.rpm
libcurl-7.29.0-35.el7.s390x.rpm
libcurl-devel-7.29.0-35.el7.s390.rpm
libcurl-devel-7.29.0-35.el7.s390x.rpm

x86_64:
curl-7.29.0-35.el7.x86_64.rpm
curl-debuginfo-7.29.0-35.el7.i686.rpm
curl-debuginfo-7.29.0-35.el7.x86_64.rpm
libcurl-7.29.0-35.el7.i686.rpm
libcurl-7.29.0-35.el7.x86_64.rpm
libcurl-devel-7.29.0-35.el7.i686.rpm
libcurl-devel-7.29.0-35.el7.x86_64.rpm

Red Hat Enterprise Linux Workstation (v. 7):

Source:
curl-7.29.0-35.el7.src.rpm

x86_64:
curl-7.29.0-35.el7.x86_64.rpm
curl-debuginfo-7.29.0-35.el7.i686.rpm
curl-debuginfo-7.29.0-35.el7.x86_64.rpm
libcurl-7.29.0-35.el7.i686.rpm
libcurl-7.29.0-35.el7.x86_64.rpm
libcurl-devel-7.29.0-35.el7.i686.rpm
libcurl-devel-7.29.0-35.el7.x86_64.rpm

These packages are GPG signed by Red Hat for security.  Our key and
details on how to verify the signature are available from
https://access.redhat.com/security/team/key/

7. References:

https://access.redhat.com/security/cve/CVE-2016-5419
https://access.redhat.com/security/cve/CVE-2016-5420
https://access.redhat.com/security/cve/CVE-2016-7141
https://access.redhat.com/security/updates/classification/#moderate
https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/7/html/7.3_Release_Notes/index.html

8. Contact:

The Red Hat security contact is <secalert@redhat.com>. More contact
details at https://access.redhat.com/security/team/contact/

Copyright 2016 Red Hat, Inc.
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