Security Experts:

High Severity Flaw Patched in OpenSSL 1.1.0

A high severity denial-of-service (DoS) vulnerability was patched on Thursday in OpenSSL with the release of version 1.1.0e.

The flaw, tracked as CVE-2017-3733, has been described as an “Encrypt-Then-Mac renegotiation crash.” The security hole, reported by Joe Orton of Red Hat on January 31, does not affect OpenSSL 1.0.2.

“During a renegotiation handshake if the Encrypt-Then-Mac extension is negotiated where it was not in the original handshake (or vice-versa) then this can cause OpenSSL to crash (dependent on ciphersuite). Both clients and servers are affected,” the OpenSSL Project said in its advisory.

The OpenSSL Project has once again reminded users that versions 1.0.1, 1.0.0 and 0.9.8 are not supported and they no longer receive security updates. Version 1.0.2 has a long term support (LTS) date of December 31, 2019, and there are no plans for a 1.0.3 release.

This is the second security update released this year. The first, released in late January, patched four low and moderate severity vulnerabilities.

Related: Non-Security OpenSSL Bugs Lead to Serious Vulnerability

Related: OpenSSL Patch for Low Severity Issue Creates Critical Flaw

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Eduard Kovacs (@EduardKovacs) is a contributing editor at SecurityWeek. He worked as a high school IT teacher for two years before starting a career in journalism as Softpedia’s security news reporter. Eduard holds a bachelor’s degree in industrial informatics and a master’s degree in computer techniques applied in electrical engineering.