NULL pointer dereference in openldap (Alpine package)

1) NULL pointer dereference

EUVDB-ID: #VU48143

Risk: Medium

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

CVE-ID: CVE-2020-25692

CWE-ID: CWE-476 - NULL Pointer Dereference

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a NULL pointer dereference error in slapd normalization handling with modrdn. A remote non-authenticated attacker can send specially crafted packet to the slapd daemon and perform a denial of service (DoS) attack.

Mitigation

Install update from vendor's website.

Vulnerable software versions

openldap (Alpine package): 2.4.24-r0 - 2.4.48-r1

External links

http://git.alpinelinux.org/aports/commit/?id=81bb543eb3291e429c43fe7a7e3de57ea10c1be7
http://git.alpinelinux.org/aports/commit/?id=8e7cb122ddf546b0be2be682f389438557bb7398
http://git.alpinelinux.org/aports/commit/?id=d6419a61850ee4384d75190a6521a687278588e2
http://git.alpinelinux.org/aports/commit/?id=1291ff82e2bfcfde8fcfa1584812259167188bef
http://git.alpinelinux.org/aports/commit/?id=2083981c08203288687c0b1cea2491a9315b8576
http://git.alpinelinux.org/aports/commit/?id=8075199ff6a5f9f9d6e379dadf596aa2e15f2719
http://git.alpinelinux.org/aports/commit/?id=c38f6687e6a4edac9cd376a31360ff3f9f645524

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.