Vulnerability identifier: #VU13589

Vulnerability risk: Low

CVSSv3.1: 3.2 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2016-1000341

CWE-ID: CWE-310

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
The Bouncy Castle Crypto Package For Java
Universal components / Libraries / Libraries used by multiple products

Vendor: Legion of the Bouncy Castle Inc.

Description

The vulnerability allows a remote attacker to disclose sensitive information.

The vulnerability exists in Bouncy Castle JCE Provider implementation of DSA signature generation process. The attacker with ability to observe timings for the generation of signatures can gain information about the signature's k value and ultimately the private value as well.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

The Bouncy Castle Crypto Package For Java: 1.41 - 1.55

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External links
http://github.com/bcgit/bc-java/commit/acaac81f96fec91ab45bd0412beaf9c3acd8defa#diff-e75226a9ca4921...

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.