#VU54107 NULL pointer dereference in 389-ds-base - CVE-2021-3514

Vulnerability identifier: #VU54107

Vulnerability risk: Medium

CVSSv4.0: 4.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2021-3514

CWE-ID: CWE-476

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 user to perform a denial of service (DoS) attack.

The vulnerability exists due to a NULL pointer dereference error when using a sync_repl client in 389-ds-base. A remote authenticated user can cause a NULL pointer dereference using a specially crafted query and perform a denial of service (DoS) attack.

Mitigation
Install update from vendor's website.

Vulnerable software versions

389-ds-base: 1.4.3.1 - 1.4.4.15, 2.0.1 - 2.0.4

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External links
https://github.com/389ds/389-ds-base/issues/4711
https://github.com/389ds/389-ds-base/commit/58dbf084a63e6dbbd999bf6a70475fad8255f26a
https://github.com/389ds/389-ds-base/commit/2e5b526012612d1d6ccace46398bee679a730271
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2021-3514

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

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