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OpenSSL: DoS Vulnerability (CVE-2021-3449) - Linux
Information
Severity
Severity
Family
Family
CVSSv2 Base
CVSSv2 Base
CVSSv2 Vector
CVSSv2 Vector
Solution Type
Solution Type
Created
Created
Modified
Modified
Summary
OpenSSL is prone to a denial of service (DoS) vulnerability.
Insight
Insight
An OpenSSL TLS server may crash if sent a maliciously crafted renegotiation ClientHello message from a client. If a TLSv1.2 renegotiation ClientHello omits the signature_algorithms extension (where it was present in the initial ClientHello), 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 (which is the default configuration). OpenSSL TLS clients are not impacted by this issue.
Affected Software
Affected Software
OpenSSL version 1.1.1 through 1.1.1j.
Detection Method
Detection Method
Checks if a vulnerable version is present on the target host.
Solution
Solution
Update OpenSSL to version 1.1.1k or later.