5 - RHSA-2015:1254

Problem Description:

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.

2. Relevant releases/architectures:

Red Hat Enterprise Linux Desktop (v. 6) - i386, x86_64 Red Hat Enterprise Linux Desktop Optional (v. 6) - i386, x86_64 Red Hat Enterprise Linux HPC Node (v. 6) - x86_64 Red Hat Enterprise Linux HPC Node Optional (v. 6) - x86_64 Red Hat Enterprise Linux Server (v. 6) - i386, ppc64, s390x, x86_64 Red Hat Enterprise Linux Workstation (v. 6) - i386, 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.

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.

4. 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

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

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