SB2018060418 - Improper verification of cryptographic signature in Bouncy Castle

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Main Vulnerability Database SB2018060418

SB2018060418 - Improper verification of cryptographic signature in Bouncy Castle

Published: June 4, 2018 Updated: July 5, 2018

Security Bulletin ID SB2018060418
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Adjecent network
Highest impact Data manipulation

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Improper verification of cryptographic signature (CVE-ID: CVE-2016-1000342)

CWE-ID: CWE-347 - Improper Verification of Cryptographic Signature

CVSSv4: CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear


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 ECDSA 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.

References