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Home > Cybersecurity > OpenSSL patched 2 high-severity vulnerabilities

OpenSSL patched 2 high-severity vulnerabilities

The OpenSSL team announced the release of a fix for two high-severity security vulnerabilities that can be exploited to carry out DDoS.

Erdem Yasar by Erdem Yasar
March 27, 2021
in Cybersecurity
2 min read
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OpenSSL patched 2 high-severity vulnerabilities
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OpenSSL released fixes for two high-severity security flaws, tracked as CVE-2021-3449 and CVE-2021-3450. The CVE-2021-3449 affects all OpenSSL 1.1.1 versions and the CVE-2021-3450 affects OpenSSL versions 1.1.1h and newer. The updated version OpenSSL 1.1.1k addresses both vulnerabilities.

DDoS and certification bypass

CVE-2021-3450 flaw is related to an X509_V_FLAG_X509_STRICT flag. OpenSSL said,

“The X509_V_FLAG_X509_STRICT flag enables additional security checks of the certificates present in a certificate chain. It is not set by default. Starting from OpenSSL version 1.1.1h a check to disallow certificates in the chain that have explicitly encoded elliptic curve parameters was added as an additional strict check. An error in the implementation of this check meant that the result of a previous check to confirm that certificates in the chain are valid CA certificates was overwritten. This effectively bypasses the check that non-CA certificates must not be able to issue other certificates.”

CVE-2021-3449 flaw is caused by TLS server crashing due to a maliciously crafted renegotiation ClientHello message from a client. OpenSSL said,

“If a TLSv1.2 renegotiation ClientHello omits the signature_algorithms extension, but includes a signature_algorithms_cert extension then a NULL pointer dereference will result, leading to a crash and a denial of service attack. A server is only vulnerable if it has TLSv1.2 and renegotiation enabled.”

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Erdem Yasar

Erdem Yasar

Erdem Yasar is a news editor at Cloud7 News. Erdem started his career by writing video game reviews in 2007 for PC World magazine while he was studying computer engineering. In the following years, he focused on software development with various programming languages. After his graduation, he continued to work as an editor for several major tech-related websites and magazines. During the 2010s, Erdem Yasar shifted his focus to cloud computing, hosting, and data centers as they were becoming more popular topics in the tech industry. Erdem Yasar also worked with various industry-leading tech companies as a content creator by writing blog posts and other articles. Prior to his role at Cloud7 News, Erdem was the managing editor of T3 Magazine.

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