RHSA-2015:1254 - Security Advisory

Topic

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

Red Hat Product Security 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

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

It was found that the libcurl library did not correctly handle partial
literal IP addresses when parsing received HTTP cookies. An attacker able
to trick a user into connecting to a malicious server could use this flaw
to set the user's cookie to a crafted domain, making other cookie-related
issues easier to exploit. (CVE-2014-3613)

A flaw was found in the way the libcurl library performed the duplication
of connection handles. If an application set the CURLOPT_COPYPOSTFIELDS
option for a handle, using the handle's duplicate could cause the
application to crash or disclose a portion of its memory. (CVE-2014-3707)

It was discovered that the libcurl library failed to properly handle URLs
with embedded end-of-line characters. An attacker able to make an
application using libcurl to access a specially crafted URL via an HTTP
proxy could use this flaw to inject additional headers to the request or
construct additional requests. (CVE-2014-8150)

It was discovered that libcurl implemented aspects of the NTLM and
Negotatiate authentication incorrectly. If an application uses libcurl
and the affected mechanisms in a specifc way, certain requests to a
previously NTLM-authenticated server could appears as sent by the wrong
authenticated user. Additionally, the initial set of credentials for HTTP
Negotiate-authenticated requests could be reused in subsequent requests,
although a different set of credentials was specified. (CVE-2015-3143,
CVE-2015-3148)

Red Hat would like to thank the cURL project for reporting these issues.

Bug fixes:

• An out-of-protocol fallback to SSL version 3.0 (SSLv3.0) was available

with libcurl. Attackers could abuse the fallback to force downgrade of the
SSL version. The fallback has been removed from libcurl. Users requiring
this functionality can explicitly enable SSLv3.0 through the libcurl API.
(BZ#1154059)

• A single upload transfer through the FILE protocol opened the destination

file twice. If the inotify kernel subsystem monitored the file, two events
were produced unnecessarily. The file is now opened only once per upload.
(BZ#883002)

• Utilities using libcurl for SCP/SFTP transfers could terminate

unexpectedly when the system was running in FIPS mode. (BZ#1008178)

• Using the "--retry" option with the curl utility could cause curl to

terminate unexpectedly with a segmentation fault. Now, adding "--retry" no
longer causes curl to crash. (BZ#1009455)

• The "curl --trace-time" command did not use the correct local time when

printing timestamps. Now, "curl --trace-time" works as expected.
(BZ#1120196)

• The valgrind utility could report dynamically allocated memory leaks on

curl exit. Now, curl performs a global shutdown of the NetScape Portable
Runtime (NSPR) library on exit, and valgrind no longer reports the memory
leaks. (BZ#1146528)

• Previously, libcurl returned an incorrect value of the

CURLINFO_HEADER_SIZE field when a proxy server appended its own headers to
the HTTP response. Now, the returned value is valid. (BZ#1161163)

Enhancements:

• The "--tlsv1.0", "--tlsv1.1", and "--tlsv1.2" options are available for

specifying the minor version of the TLS protocol to be negotiated by NSS.
The "--tlsv1" option now negotiates the highest version of the TLS protocol
supported by both the client and the server. (BZ#1012136)

• It is now possible to explicitly enable or disable the ECC and the new

AES cipher suites to be used for TLS. (BZ#1058767, BZ#1156422)

All curl users are advised to upgrade to these updated packages, which
contain backported patches to correct these issues and add these
enhancements.

Solution

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

For details on how to apply this update, refer to:

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

Affected Products

• Red Hat Enterprise Linux Server 6 x86_64
• Red Hat Enterprise Linux Server 6 i386
• 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 Power, big endian 6 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 - Extended Life Cycle Support (for IBM z Systems) 6 s390x

Fixes

• BZ - 835898 - Bug in DNS cache causes connections until restart of libcurl-using processes
• BZ - 883002 - curl used with file:// protocol opens and closes a destination file twice
• BZ - 997185 - sendrecv.c example incorrect type for sockfd
• BZ - 1008178 - curl scp download fails in fips mode
• BZ - 1011083 - CA certificate cannot be specified by nickname [documentation bug]
• BZ - 1011101 - manpage typos found using aspell
• BZ - 1058767 - curl does not support ECDSA certificates
• BZ - 1104160 - Link in curl man page is wrong
• BZ - 1136154 - CVE-2014-3613 curl: incorrect handling of IP addresses in cookie domain
• BZ - 1154059 - curl: Disable out-of-protocol fallback to SSL 3.0
• BZ - 1154747 - NTLM: ignore CURLOPT_FORBID_REUSE during NTLM HTTP auth
• BZ - 1154941 - CVE-2014-3707 curl: incorrect handle duplication after COPYPOSTFIELDS
• BZ - 1156422 - curl does not allow explicit control of DHE ciphers
• BZ - 1161163 - Response headers added by proxy servers missing in CURLINFO_HEADER_SIZE
• BZ - 1168137 - curl closes connection after HEAD request fails
• BZ - 1178692 - CVE-2014-8150 curl: URL request injection vulnerability in parseurlandfillconn()
• BZ - 1213306 - CVE-2015-3143 curl: re-using authenticated connection when unauthenticated
• BZ - 1213351 - CVE-2015-3148 curl: Negotiate not treated as connection-oriented

CVEs

• CVE-2015-3143
• CVE-2014-3707
• CVE-2014-3613
• CVE-2014-8150
• CVE-2015-3148

References

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