Security Bulletin: OpenSSL Vulnerabilities Affect IBM Sterling Connect:Express for UNIX (CVE-2021-3449, CVE-2021-3450)

Summary

Security vulnerabilities have been disclosed on 25h March 2021 by the OpenSSL Project. OpenSSl is used by IBM Sterling Connect:Express for UNIX. IBM Sterling Connect:Express for UNIX has addressed the applicable CVE.

Vulnerability Details

CVEID:CVE-2021-3449
**DESCRIPTION:**OpenSSL is vulnerable to a denial of service, caused by a NULL pointer dereference in signature_algorithms processing. By sending a specially crafted renegotiation ClientHello message from a client, a remote attacker could exploit this vulnerability to cause the TLS server to crash.
CVSS Base score: 7.5
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/198752 for the current score.
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)

CVEID:CVE-2021-3450
**DESCRIPTION:**OpenSSL could allow a remote attacker to bypass security restrictions, caused by a a missing check in the validation logic of X.509 certificate chains by the X509_V_FLAG_X509_STRICT flag. By using any valid certificate or certificate chain to sign a specially crafted certificate, an attacker could bypass the check that non-CA certificates must not be able to issue other certificates and override the default purpose.
CVSS Base score: 7.4
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/198754 for the current score.
CVSS Vector: (CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:H)

Affected Products and Versions

Remediation/Fixes

Apply the OpenSSL 1.1.1k Updater for Connect:Express for Unix available on Fix Central.

For versions prior 1.5.0.1600 upgrade to 1.5.0.1606 before applying the OpenSSL 1.1.1k Updater.

Workarounds and Mitigations

None