Vulnerability identifier: #VU54105

Vulnerability risk: Medium

CVSSv3.1: 4.6 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-35518

CWE-ID: CWE-200

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
389-ds-base
Server applications / Directory software, identity management

Vendor: 389 Directory Server Project

Description

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

The vulnerability exists due to excessive data output by the application. When binding against a DN during authentication, the reply from 389-ds-base will be different whether the DN exists or not. This can be used by an unauthenticated attacker to check the existence of an entry in the LDAP database.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

389-ds-base: 2.0.1 - 2.0.2, 1.4.4.0 - 1.4.4.12, 1.4.3.1 - 1.4.3.18, 1.4.2.4 - 1.4.2.16

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External links
http://bugzilla.redhat.com/show_bug.cgi?id=1905565
http://github.com/389ds/389-ds-base/commit/b6aae4d8e7c8a6ddd21646f94fef1bf7f22c3f32
http://github.com/389ds/389-ds-base/commit/cc0f69283abc082488824702dae485b8eae938bc
http://github.com/389ds/389-ds-base/issues/4480

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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.