Security Bulletin: Multiple Vulnerabilities in GSKit Affect IBM Sterling Connect:Direct for Microsoft Windows

Security Bulletin

Summary

Vulnerabilities have been found in the IBM GSKit component used by IBM Sterling Connect:Direct for Microsoft Windows. IBM Sterling Connect:Direct for Microsoft Windows has addressed the applicable CVEs.

Vulnerability Details

CVEID: CVE-2017-3732
DESCRIPTION: OpenSSL could allow a remote attacker to obtain sensitive information, caused by a carry propagating bug in the x86_64 Montgomery squaring procedure. An attacker could exploit this vulnerability to obtain information about the private key.
CVSS Base Score: 5.3
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/121313 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N)

CVEID: CVE-2017-3736
DESCRIPTION: OpenSSL could allow a remote attacker to obtain sensitive information, caused by a carry propagation flaw in the x86_64 Montgomery squaring function bn_sqrx8x_internal(). An attacker with online access to an unpatched system could exploit this vulnerability to obtain information about the private key.
CVSS Base Score: 5.9
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/134397 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N)

CVEID: CVE-2018-1427
DESCRIPTION: IBM GSKit contains several environment variables that a local attacker could overflow and cause a denial of service.
CVSS Base Score: 6.2
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/139072 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)

Affected Products and Versions

IBM Sterling Connect:Direct for Microsoft Windows 4.7.0.0 through 4.7.0.5_iFix012

Remediation/Fixes

Product	VRMF	APAR	Remediation/First Fix
IBM Sterling Connect:Direct for Microsoft Windows	4.7.0	IT24136	Apply 4.7.0.5_iFix013, available on Fix Central

For older versions/releases IBM recommends upgrading to a fixed, supported version/release of the product.

Workarounds and Mitigations

To protect the system from issues CVE-2017-3732 & CVE-2017-3736, only use Cipher Suites that start with TLS_ECDHE_ECDSA...

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References

Complete CVSS v2 Guide
On-line Calculator v2

Complete CVSS v3 Guide
On-line Calculator v3

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Change History

26 March 2018: Original Version Published
29 March 2018: CVE-2018-1428 removed (not vulnerable)
17 April 2018: Workarounds and Mitigations updated

*The CVSS Environment Score is customer environment specific and will ultimately impact the Overall CVSS Score. Customers can evaluate the impact of this vulnerability in their environments by accessing the links in the Reference section of this Security Bulletin.

Disclaimer

Review the IBM security bulletin disclaimer and definitions regarding your responsibilities for assessing potential impact of security vulnerabilities to your environment.

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Tips

Security Bulletin: Multiple Vulnerabilities in GSKit Affect IBM Sterling Connect:Direct for Microsoft Windows