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Category:   Application (Generic)  >   cURL Vendors:   curl.haxx.se
(Red Hat Issues Fix) libcurl Integer Overflow in Escape Functions May Let Users Execute Arbitrary Code on the Target System
SecurityTracker Alert ID:  1039032
SecurityTracker URL:  http://securitytracker.com/id/1039032
CVE Reference:   CVE-2016-7167   (Links to External Site)
Date:  Aug 1 2017
Impact:   Execution of arbitrary code via local system, Execution of arbitrary code via network, User access via local system, User access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): libcurl 7.11.1 - 7.50.2
Description:   A vulnerability was reported in libcurl. A user can execute arbitrary code on the target system.

A user can supply a specially crafted length parameter value to certain libcurl functions to trigger an integer overflow and execute arbitrary code on the target system.

The curl_escape(), curl_easy_escape(), curl_unescape(), and curl_easy_unescape() functions are affected.

The specific impact depends on the application using libcurl.

The curl command line tool is not affected.

The Mitre CVE Assignment Team reported this vulnerability.

Impact:   A user can execute arbitrary code on the target system.
Solution:   Red Hat has issued a fix.

The Red Hat advisory is available at:

https://access.redhat.com/errata/RHSA-2017:2016

Vendor URL:  access.redhat.com/errata/RHSA-2017:2016 (Links to External Site)
Cause:   Boundary 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 15 2016 libcurl Integer Overflow in Escape Functions May Let Users Execute Arbitrary Code on the Target System



 Source Message Contents

Subject:  [RHSA-2017:2016-01] Moderate: curl security, bug fix, and enhancement update

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

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

Synopsis:          Moderate: curl security, bug fix, and enhancement update
Advisory ID:       RHSA-2017:2016-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://access.redhat.com/errata/RHSA-2017:2016
Issue date:        2017-08-01
CVE Names:         CVE-2016-7167 
=====================================================================

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):

* Multiple integer overflow flaws leading to heap-based buffer overflows
were found in the way curl handled escaping and unescaping of data. An
attacker could potentially use these flaws to crash an application using
libcurl by sending a specially crafted input to the affected libcurl
functions. (CVE-2016-7167)

Additional Changes:

For detailed information on changes in this release, see the Red Hat
Enterprise Linux 7.4 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/):

1341503 - Curl request for HTTP GET with Cookie to an IPV6 address does not send the cookie
1374740 - libcurl does not accept use of ciphers *-SHA384
1375906 - CVE-2016-7167 curl: escape and unescape integer overflows
1388162 - HTTPS request hangs when HTTP proxy responds too soon
1404815 - SEC_ERROR_NO_TOKEN error when using SSL and multiple threads
1420327 - CURL 7.29 cannot connect to FTPS using proxytunnel

6. Package List:

Red Hat Enterprise Linux Client (v. 7):

Source:
curl-7.29.0-42.el7.src.rpm

x86_64:
curl-7.29.0-42.el7.x86_64.rpm
curl-debuginfo-7.29.0-42.el7.i686.rpm
curl-debuginfo-7.29.0-42.el7.x86_64.rpm
libcurl-7.29.0-42.el7.i686.rpm
libcurl-7.29.0-42.el7.x86_64.rpm

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

x86_64:
curl-debuginfo-7.29.0-42.el7.i686.rpm
curl-debuginfo-7.29.0-42.el7.x86_64.rpm
libcurl-devel-7.29.0-42.el7.i686.rpm
libcurl-devel-7.29.0-42.el7.x86_64.rpm

Red Hat Enterprise Linux ComputeNode (v. 7):

Source:
curl-7.29.0-42.el7.src.rpm

x86_64:
curl-7.29.0-42.el7.x86_64.rpm
curl-debuginfo-7.29.0-42.el7.i686.rpm
curl-debuginfo-7.29.0-42.el7.x86_64.rpm
libcurl-7.29.0-42.el7.i686.rpm
libcurl-7.29.0-42.el7.x86_64.rpm

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

x86_64:
curl-debuginfo-7.29.0-42.el7.i686.rpm
curl-debuginfo-7.29.0-42.el7.x86_64.rpm
libcurl-devel-7.29.0-42.el7.i686.rpm
libcurl-devel-7.29.0-42.el7.x86_64.rpm

Red Hat Enterprise Linux Server (v. 7):

Source:
curl-7.29.0-42.el7.src.rpm

aarch64:
curl-7.29.0-42.el7.aarch64.rpm
curl-debuginfo-7.29.0-42.el7.aarch64.rpm
libcurl-7.29.0-42.el7.aarch64.rpm
libcurl-devel-7.29.0-42.el7.aarch64.rpm

ppc64:
curl-7.29.0-42.el7.ppc64.rpm
curl-debuginfo-7.29.0-42.el7.ppc.rpm
curl-debuginfo-7.29.0-42.el7.ppc64.rpm
libcurl-7.29.0-42.el7.ppc.rpm
libcurl-7.29.0-42.el7.ppc64.rpm
libcurl-devel-7.29.0-42.el7.ppc.rpm
libcurl-devel-7.29.0-42.el7.ppc64.rpm

ppc64le:
curl-7.29.0-42.el7.ppc64le.rpm
curl-debuginfo-7.29.0-42.el7.ppc64le.rpm
libcurl-7.29.0-42.el7.ppc64le.rpm
libcurl-devel-7.29.0-42.el7.ppc64le.rpm

s390x:
curl-7.29.0-42.el7.s390x.rpm
curl-debuginfo-7.29.0-42.el7.s390.rpm
curl-debuginfo-7.29.0-42.el7.s390x.rpm
libcurl-7.29.0-42.el7.s390.rpm
libcurl-7.29.0-42.el7.s390x.rpm
libcurl-devel-7.29.0-42.el7.s390.rpm
libcurl-devel-7.29.0-42.el7.s390x.rpm

x86_64:
curl-7.29.0-42.el7.x86_64.rpm
curl-debuginfo-7.29.0-42.el7.i686.rpm
curl-debuginfo-7.29.0-42.el7.x86_64.rpm
libcurl-7.29.0-42.el7.i686.rpm
libcurl-7.29.0-42.el7.x86_64.rpm
libcurl-devel-7.29.0-42.el7.i686.rpm
libcurl-devel-7.29.0-42.el7.x86_64.rpm

Red Hat Enterprise Linux Workstation (v. 7):

Source:
curl-7.29.0-42.el7.src.rpm

x86_64:
curl-7.29.0-42.el7.x86_64.rpm
curl-debuginfo-7.29.0-42.el7.i686.rpm
curl-debuginfo-7.29.0-42.el7.x86_64.rpm
libcurl-7.29.0-42.el7.i686.rpm
libcurl-7.29.0-42.el7.x86_64.rpm
libcurl-devel-7.29.0-42.el7.i686.rpm
libcurl-devel-7.29.0-42.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-2016-7167
https://access.redhat.com/security/updates/classification/#moderate
https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/7/html/7.4_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 2017 Red Hat, Inc.
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