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Test ID:1.3.6.1.4.1.25623.1.0.105880
Category:SSL and TLS
Title:SSL/TLS: Certificate Signed Using A Weak Signature Algorithm
Summary:The remote service is using a SSL/TLS certificate in the certificate chain that has been signed using a; cryptographically weak hashing algorithm.
Description:Summary:
The remote service is using a SSL/TLS certificate in the certificate chain that has been signed using a
cryptographically weak hashing algorithm.

Vulnerability Insight:
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

Solution:
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.

CVSS Score:
4.0

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

CopyrightCopyright (C) 2016 Greenbone Networks GmbH

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