Vulnerability Details

SSL/TLS: Certificate Signed Using A Weak Signature Algorithm

Published: 2016-08-22 15:35:50

CVSS Base Vector:
AV:N/AC:H/Au:N/C:P/I:P/A:N

Technical Details:
The following hashing algorithms used for signing SSL/TLS certificates are considered cryptographically weak and not secure enough for ongoing use: - Secure Hash Algorithm 1 (SHA-1) - Message Digest 5 (MD5) - Message Digest 4 (MD4) - Message Digest 2 (MD2) Beginning as late as January 2017 and as early as June 2016, browser developers such as Microsoft and Google will begin warning users when visiting web sites that use SHA-1 signed Secure Socket Layer (SSL) certificates. NOTE: The script preference allows to set one or more custom SHA-1 fingerprints of CA certificates which are trusted by this routine. The fingerprints needs to be passed comma-separated and case-insensitive: Fingerprint1 or fingerprint1,Fingerprint2

Recommendations:
Servers that use SSL/TLS certificates signed with a weak SHA-1, MD5, MD4 or MD2 hashing algorithm will need to obtain new SHA-2 signed SSL/TLS certificates to avoid web browser SSL/TLS certificate warnings.

Detection Method:
Check which hashing algorithm was used to sign the remote SSL/TLS certificate.

Summary:
The remote service is using a SSL/TLS certificate in the certificate chain that has been signed using a cryptographically weak hashing algorithm.

Solution Type:
Mitigation

Detection Type:
Remote Banner

References:

https://blog.mozilla.org/security/2014/09/23/phasing-out-certificates-with-sha-1-based-signature-algorithms/

Severity
Medium
CVSS Score
4.0
Published
2016-08-22
Modified
2018-09-21
Category
SSL and TLS

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