Information disclosure in Bouncy Castle BC Java



Published: 2021-07-20
Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2020-15522
CWE-ID CWE-208
Exploitation vector Network
Public exploit N/A
Vulnerable software
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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 medium risk vulnerability.

1) Information Exposure Through Timing Discrepancy

EUVDB-ID: #VU55035

Risk: Medium

CVSSv3.1: 5.2 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-15522

CWE-ID: CWE-208 - Information Exposure Through Timing Discrepancy

Exploit availability: No

Description

The vulnerability allows a remote attacker to gain access to sensitive information.

The vulnerability exists due to a timing issue within the EC math library. A remote attacker who can observe timing information for the generation of multiple deterministic ECDSA signatures is able to reconstruct the private key used for encryption.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

The Bouncy Castle Crypto Package For Java: 1.0 - 1.65


CPE2.3 External links

http://github.com/bcgit/bc-csharp/wiki/CVE-2020-15522
http://www.bouncycastle.org/releasenotes.html
http://github.com/bcgit/bc-java/wiki/CVE-2020-15522
http://security.netapp.com/advisory/ntap-20210622-0007/

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.



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