RHSA-2014:0561 - Security Advisory

Topic

Updated curl packages that fix two security issues and several bugs are now
available for Red Hat Enterprise Linux 6.

The Red Hat Security Response Team has rated this update as having Moderate
security impact. Common Vulnerability Scoring System (CVSS) base scores,
which give detailed severity ratings, are available for each vulnerability
from the CVE links in the References section.

Description

cURL provides the libcurl library and a command line tool for downloading
files from servers using various protocols, including HTTP, FTP, and LDAP.

It was found that libcurl could incorrectly reuse existing connections for
requests that should have used different or no authentication credentials,
when using one of the following protocols: HTTP(S) with NTLM
authentication, LDAP(S), SCP, or SFTP. If an application using the libcurl
library connected to a remote server with certain authentication
credentials, this flaw could cause other requests to use those same
credentials. (CVE-2014-0015, CVE-2014-0138)

Red Hat would like to thank the cURL project for reporting these issues.
Upstream acknowledges Paras Sethia as the original reporter of
CVE-2014-0015 and Yehezkel Horowitz for discovering the security impact of
this issue, and Steve Holme as the original reporter of CVE-2014-0138.

This update also fixes the following bugs:

• Previously, the libcurl library was closing a network socket without

first terminating the SSL connection using the socket. This resulted in a
write after close and consequent leakage of memory dynamically allocated by
the SSL library. An upstream patch has been applied on libcurl to fix this
bug. As a result, the write after close no longer happens, and the SSL
library no longer leaks memory. (BZ#1092479)

• Previously, the libcurl library did not implement a non-blocking SSL

handshake, which negatively affected performance of applications based on
libcurl's multi API. To fix this bug, the non-blocking SSL handshake has
been implemented by libcurl. With this update, libcurl's multi API
immediately returns the control back to the application whenever it cannot
read/write data from/to the underlying network socket. (BZ#1092480)

• Previously, the curl package could not be rebuilt from sources due to an

expired cookie in the upstream test-suite, which runs during the build. An
upstream patch has been applied to postpone the expiration date of the
cookie, which makes it possible to rebuild the package from sources again.
(BZ#1092486)

• Previously, the libcurl library attempted to authenticate using Kerberos

whenever such an authentication method was offered by the server. This
caused problems when the server offered multiple authentication methods and
Kerberos was not the selected one. An upstream patch has been applied on
libcurl to fix this bug. Now libcurl no longer uses Kerberos authentication
if another authentication method is selected. (BZ#1096797)

All curl users are advised to upgrade to these updated packages, which
contain backported patches to correct these issues. All running
applications that use libcurl have to be restarted for this update to
take effect.

Solution

Before applying this update, make sure all previously released errata
relevant to your system have been applied.

This update is available via the Red Hat Network. Details on how to use the
Red Hat Network to apply this update are available at
https://access.redhat.com/site/articles/11258

Affected Products

• Red Hat Enterprise Linux Server 6 x86_64
• Red Hat Enterprise Linux Server 6 i386
• Red Hat Enterprise Linux for x86_64 - Extended Update Support 6.5 x86_64
• Red Hat Enterprise Linux for x86_64 - Extended Update Support 6.5 i386
• Red Hat Enterprise Linux Server - AUS 6.5 x86_64
• Red Hat Enterprise Linux Server - Extended Life Cycle Support 6 x86_64
• Red Hat Enterprise Linux Server - Extended Life Cycle Support 6 i386
• Red Hat Enterprise Linux Workstation 6 x86_64
• Red Hat Enterprise Linux Workstation 6 i386
• Red Hat Enterprise Linux Desktop 6 x86_64
• Red Hat Enterprise Linux Desktop 6 i386
• Red Hat Enterprise Linux for IBM z Systems 6 s390x
• Red Hat Enterprise Linux for IBM z Systems - Extended Update Support 6.5 s390x
• Red Hat Enterprise Linux for Power, big endian 6 ppc64
• Red Hat Enterprise Linux for Power, big endian - Extended Update Support 6.5 ppc64
• Red Hat Enterprise Linux for Scientific Computing 6 x86_64
• Red Hat Enterprise Linux Server from RHUI 6 x86_64
• Red Hat Enterprise Linux Server from RHUI 6 i386
• Red Hat Enterprise Linux Server - TUS 6.5 x86_64
• Red Hat Enterprise Linux Server - Extended Life Cycle Support (for IBM z Systems) 6 s390x
• Red Hat Enterprise Linux Server - Extended Update Support from RHUI 6.5 x86_64
• Red Hat Enterprise Linux Server - Extended Update Support from RHUI 6.5 i386
• Red Hat Enterprise Linux EUS Compute Node 6.5 x86_64
• Red Hat Enterprise Linux Server - Extended Life Cycle Support Extension 6 x86_64
• Red Hat Enterprise Linux Server - Extended Life Cycle Support Extension 6 i386
• Red Hat Enterprise Linux Server - Extended Life Cycle Support Extension (for IBM z Systems) 6 s390x

Fixes

• BZ - 1053903 - CVE-2014-0015 curl: re-use of wrong HTTP NTLM connection in libcurl
• BZ - 1079148 - CVE-2014-0138 curl: wrong re-use of connections in libcurl
• BZ - 1092486 - problem with building curl package
• BZ - 1096797 - RHEL-6 libcurl fails when using digest auth and have multiple auth options

CVEs

• CVE-2014-0138
• CVE-2014-0015

References

• https://access.redhat.com/security/updates/classification/#moderate