Integer underflow in openldap (Alpine package)

1) Integer underflow

EUVDB-ID: #VU50389

Risk: Medium

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-36221

CWE-ID: CWE-191 - Integer underflow

Exploit availability: No

Description

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

The vulnerability exists due to integer underflow within the serialNumberAndIssuerCheck() function in schema_init.c. A remote attacker can send a specially crafted request to the affected application, trigger an integer underflow and crash the slapd.

Mitigation

Install update from vendor's website.

Vulnerable software versions

openldap (Alpine package): 2.4.24-r0 - 2.4.56-r0

CPE2.3

• cpe:2.3:o:alpine:openldap_alpine_package:2.4.50-r2:*:*:*:*:alpine_linux:*:
• cpe:2.3:o:alpine:openldap_alpine_package:2.4.50-r1:*:*:*:*:alpine_linux:*:
• cpe:2.3:o:alpine:openldap_alpine_package:2.4.48-r3:*:*:*:*:alpine_linux:*:

External links

http://git.alpinelinux.org/aports/commit/?id=a2dc275fa79022f02431a3557b92a800d0dbc076
http://git.alpinelinux.org/aports/commit/?id=f47320d0d907515cff98ab938fb8b7208466c56e
http://git.alpinelinux.org/aports/commit/?id=ab53f566e28a24fdc63802323809ee5a25d81220

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.