LDAP injection in Bouncy Castle for Java

1) LDAP injection

EUVDB-ID: #VU78328

Risk: Medium

CVSSv3.1: 5.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2023-33201

CWE-ID: CWE-90 - Improper Neutralization of Special Elements used in an LDAP Query ('LDAP Injection')

Exploit availability: No

Description

The vulnerability allows a remote attacker to bypass authentication process.

The vulnerability exists due to improper input validation in applications that use an LDAP CertStore from Bouncy Castle to validate X.509 certificates. During the certificate validation process, Bouncy Castle inserts the certificate's Subject Name into an LDAP search filter without any escaping, which leads to an LDAP injection vulnerability. A remote non-authenticated attacker can use a specially crafted X.509 certificate to bypass authentication process and gain unauthorized access to the application.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

The Bouncy Castle Crypto Package For Java: 1.0 - 1.73

CPE2.3

• cpe:2.3:a:legion_of_the_bouncy_castle:bc-java:1.73:*:*:*:*:*:*:*
• cpe:2.3:a:legion_of_the_bouncy_castle:bc-java:1.72.2:*:*:*:*:*:*:*
• cpe:2.3:a:legion_of_the_bouncy_castle:bc-java:1.72:*:*:*:*:*:*:*

External links

http://github.com/bcgit/bc-java/commit/e8c409a8389c815ea3fda5e8b94c92fdfe583bcc
http://github.com/bcgit/bc-java/wiki/CVE-2023-33201
http://bouncycastle.org

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.