Improper Authorization in openldap (Alpine package)

Published: 2019-07-25

Risk	Low
Patch available	YES
Number of vulnerabilities	1
CVE-ID	CVE-2019-13565
CWE-ID	CWE-285
Exploitation vector	Local network
Public exploit	N/A
Vulnerable software	openldap (Alpine package) Operating systems & Components / Operating system package or component
Vendor	Alpine Linux Development Team

Security Bulletin

This security bulletin contains one low risk vulnerability.

1) Improper Authorization

EUVDB-ID: #VU19562

Risk: Low

CVSSv4.0: 1.1 [CVSS:4.0/AV:A/AC:L/AT:N/PR:H/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2019-13565

CWE-ID: CWE-285 - Improper Authorization

Exploit availability: No

Description

The vulnerability allows a remote attacker to escalate privileges.

The vulnerability exists due to incorrect processing of SASL authentication and session encryption in OpenLDAP. After the first SASL bind is completed, the sasl_ssf value is retained for all new non-SASL connections, allowing to bypass ACLs and obtain access by performing simple binds.

Mitigation

Install update from vendor's website.

Vulnerable software versions

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

CPE2.3

External links

https://git.alpinelinux.org/aports/commit/?id=9ddc3495242d68471af48fd96331ba0d40570080
https://git.alpinelinux.org/aports/commit/?id=d2d4b8f40c5ce345d2fa7e6812b200450f4d1973
https://git.alpinelinux.org/aports/commit/?id=eb7c99fb435406b592f0b923ab91a380ed04eb64
https://git.alpinelinux.org/aports/commit/?id=245b526abb5493a981c7ad33f9a6b264fcd11265
https://git.alpinelinux.org/aports/commit/?id=9eb2f7f4d4ac07bbabe6a18f96444a50fc2cc5b2
https://git.alpinelinux.org/aports/commit/?id=af3ed181bcf3f7faf6fa68921476a724d8bd0e0f
https://git.alpinelinux.org/aports/commit/?id=fad85a325388ffbdb0f30f6396fdb8188f0725ac

Q & A

Can this vulnerability be exploited remotely?

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

Is there known malware, which exploits this vulnerability?

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