#VU60867 Use-after-free in 389-ds-base - CVE-2021-4091

Vulnerability identifier: #VU60867

Vulnerability risk: Medium

CVSSv4.0: 4.6 [CVSS:4.0/AV:A/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-2021-4091

CWE-ID: CWE-416

Exploitation vector: Local 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 use-after-free error when processing virtual attributes context in persistent searches. A remote user can send specially crafted search requests to the directory server, trigger a use-after-free error and crash the server.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

389-ds-base: 1.3.0 - 1.3.0.8, 1.3.1.0 - 1.3.1.19, 1.3.2.26 - 1.3.2.27, 1.3.3.1 - 1.3.3.14, 1.3.4 - 1.3.4.14, 1.3.5.1 - 1.3.5.19, 1.3.6 - 1.3.6.15, 1.3.7 - 1.3.7.10, 1.3.8 - 1.3.8.10, 1.3.9.0

---

External links
https://bugzilla.redhat.com/show_bug.cgi?id=2030307

---

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the local network (LAN).

Is there known malware, which exploits this vulnerability?

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