Security Bulletin: Vulnerabilities in OpenSSL affect IBM® Rational Team Concert™ Build Agent (CVE-2015-1788, CVE-2015-1789, CVE-2015-1790, CVE-2015-1791, CVE-2015-1792, CVE-2014-8176)

Summary

OpenSSL vulnerabilities were disclosed on June 11, 2015 by the OpenSSL Project. OpenSSL is used by IBM® Rational Team Concert™ Build Agent. IBM® Rational Team Concert™ Build Agent has addressed the applicable CVEs.

Vulnerability Details

CVEID: CVE-2015-1788**
DESCRIPTION:** OpenSSL is vulnerable to a denial of service, caused by an error when processing an ECParameters structure over a specially crafted binary polynomial field. A remote attacker could exploit this vulnerability to cause the application to enter into an infinite loop.
CVSS Base Score: 5
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/#/vulnerabilities/103778 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (AV:N/AC:L/Au:N/C:N/I:N/A:P)

CVEID: CVE-2015-1789**
DESCRIPTION:** OpenSSL is vulnerable to a denial of service, caused by an out-of-bounds read in X509_cmp_time. An attacker could exploit this vulnerability using a specially crafted certificate or CRL to trigger a segmentation fault.
CVSS Base Score: 5
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/#/vulnerabilities/103779 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (AV:N/AC:L/Au:N/C:N/I:N/A:P)

CVEID: CVE-2015-1790**
DESCRIPTION:** OpenSSL is vulnerable to a denial of service, caused by the improper handling of missing inner EncryptedContent by the PKCS#7 parsing code. An attacker could exploit this vulnerability using specially crafted ASN.1-encoded PKCS#7 blobs with missing content to trigger a NULL pointer dereference.
CVSS Base Score: 5
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/#/vulnerabilities/103780 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (AV:N/AC:L/Au:N/C:N/I:N/A:P)

CVEID: CVE-2015-1791**
DESCRIPTION:** A double-free memory error in OpenSSL in the ssl3_get_new_session_ticket() function has an unknown impact. By returning a specially crafted NewSessionTicket message, an attacker could cause the client to reuse a previous ticket resulting in a race condition.
CVSS Base Score: 5
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/#/vulnerabilities/103609 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (AV:N/AC:L/Au:N/C:N/I:P/A:N)

CVEID: CVE-2015-1792**
DESCRIPTION:** OpenSSL is vulnerable to a denial of service, caused by an error when verifying a signedData message. An attacker could exploit this vulnerability using an unknown hash function OID to cause the application to enter into an infinite loop.
CVSS Base Score: 5
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/#/vulnerabilities/103781 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (AV:N/AC:L/Au:N/C:N/I:N/A:P)

CVEID: CVE-2014-8176**
DESCRIPTION:** OpenSSL could allow a remote authenticated attacker to execute arbitrary code on the system, caused by an invalid free error when application data between the ChangeCipherSpec and Finished messages is received by the DTLS peer. An attacker could exploit this vulnerability to trigger a segmentation fault or possibly corrupt memory and execute arbitrary code on the system.
CVSS Base Score: 6.5
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/#/vulnerabilities/103782 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (AV:N/AC:L/Au:S/C:P/I:P/A:P)

Affected Products and Versions

Only the Rational Team Concert Build Agent uses the OpenSSL component and is affected by these vulnerabilities. No other part of Rational Team Concert is impacted.

Rational Team Concert 3.0.x, 4.0.x, 5.0.x, and 6.0 are affected versions.

The following operating systems are not impacted in any RTC release:
- IBM i
- Linux on Power

Remediation/Fixes

The remediation for this security exposure is to update the Rational Build Agent that is included with the Rational Team Concert Build System Toolkit. Refer to the following list to determine the approach to take for the operating system that is being used for the Build System Toolkit.

This Build Forge agent interim fix or later can be used to obtain the replacement agent for your operating systems.

• For the following combinations :

- Windows and RTC 3.0.1.x, 4.0.x, 5.0.x, or 6.0
- Linux x86 and RTC 3.0.1.x, 4.0.x, 5.0.x, or 6.0
- Linux on System z and RTC 3.0.1.x, 4.0.x, 5.0.x, or 6.0
- Solaris and RTC 3.0.1.x, 4.0.x, 5.0.x Obtain the updated agent install package from the Build Forge Agent interim fix and replace it in the installed build system toolkit.

• • For AIX in RTC 3.0.1.x, 4.0.x, 5.0.x, and 6.0 : Obtain the updated agent install package and install it on an AIX machine. Extract the resulting bfagent executable and replace in the build system toolkit.

Workarounds and Mitigations

These vulnerabilities are only in the Build Agent, so not using the build agent component is a mitigation.