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OpenSSL: Segmentation fault in SSL_check_chain (CVE-2020-1967) (Windows)

Information

Severity

Severity

Medium

Family

Family

Denial of Service

CVSSv2 Base

CVSSv2 Base

5.0

CVSSv2 Vector

CVSSv2 Vector

AV:N/AC:L/Au:N/C:N/I:N/A:P

Solution Type

Solution Type

Vendor Patch

Created

Created

2 years ago

Modified

Modified

2 years ago

Share

Summary

OpenSSL server or client applications are prone to a denial-of-service vulnerability.

Insight

Insight

Server or client applications that call the SSL_check_chain() function during or after a TLS 1.3 handshake may crash due to a NULL pointer dereference as a result of incorrect handling of the 'signature_algorithms_cert' TLS extension. The crash occurs if an invalid or unrecognised signature algorithm is received from the peer.

Affected Software

Affected Software

OpenSSL versions 1.1.1d, 1.1.1e, and 1.1.1f. This issue does not impact OpenSSL versions prior to 1.1.1d.

Detection Method

Detection Method

Checks if a vulnerable version is present on the target host.

Solution

Solution

Update OpenSSL to version 1.1.1g or later. See the references for more details.

Common Vulnerabilities and Exposures (CVE)

References

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