Improper verification of cryptographic signature in Bouncy Castle
| Risk | Low |
| Patch available | YES |
| Number of vulnerabilities | 1 |
| CVE-ID | CVE-2016-1000338 |
| CWE-ID | CWE-347 |
| Exploitation vector | Local network |
| Public exploit | N/A |
| Vulnerable software Subscribe |
The Bouncy Castle Crypto Package For Java Universal components / Libraries / Libraries used by multiple products |
| Vendor | Legion of the Bouncy Castle Inc. |
Security Bulletin
This security bulletin contains one low risk vulnerability.
1) Improper verification of cryptographic signature
EUVDB-ID: #VU13586
Risk: Low
CVSSv3.1: 3.8 [CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N/E:U/RL:O/RC:C]
CVE-ID: CVE-2016-1000338
CWE-ID:
CWE-347 - Improper Verification of Cryptographic Signature
Exploit availability: No
Description
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.
Mitigation
Install updates from vendor's website.
Vulnerable software versionsThe Bouncy Castle Crypto Package For Java: 1.41 - 1.55
External linksQ & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the local network (LAN).
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
