SB2018060112 - Improper verification of cryptographic signature in Bouncy Castle
Published: June 1, 2018 Updated: July 5, 2018
Security Bulletin ID
SB2018060112
Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Adjecent network
Highest impact
Data manipulation
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Improper verification of cryptographic signature (CVE-ID: CVE-2016-1000338)
The vulnerability allows a remote attacker to bypass signature validation process.
The JCE Provider in Bouncy Castle does not fully validate ASN.1 encoding of signature on verification within DSA implementation. A remote attacker can inject extra elements in the sequence making up the signature, which will be considered valid allowing an attacker to add extra data into a signed structure.
Remediation
Install update from vendor's website.