Amazon Linux AMI update for 389-ds-base

1) Use-after-free

EUVDB-ID: #VU60867

Risk: Medium

CVSSv3.1: 5 [CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-4091

CWE-ID: CWE-416 - Use After Free

Exploit availability: No

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

Update the affected packages:

i686:
    389-ds-base-devel-1.3.10.2-16.69.amzn1.i686
    389-ds-base-snmp-1.3.10.2-16.69.amzn1.i686
    389-ds-base-libs-1.3.10.2-16.69.amzn1.i686
    389-ds-base-1.3.10.2-16.69.amzn1.i686
    389-ds-base-debuginfo-1.3.10.2-16.69.amzn1.i686

src:
    389-ds-base-1.3.10.2-16.69.amzn1.src

x86_64:
    389-ds-base-snmp-1.3.10.2-16.69.amzn1.x86_64
    389-ds-base-1.3.10.2-16.69.amzn1.x86_64
    389-ds-base-debuginfo-1.3.10.2-16.69.amzn1.x86_64
    389-ds-base-libs-1.3.10.2-16.69.amzn1.x86_64
    389-ds-base-devel-1.3.10.2-16.69.amzn1.x86_64

Vulnerable software versions

Amazon Linux AMI: All versions

389-ds-base: before 1.3.10.2-16.69

External links

http://alas.aws.amazon.com/ALAS-2022-1629.html

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.