Denial of service in OpenLDAP

1) Double free error

EUVDB-ID: #VU6842

Risk: Low

CVSSv4.0: 4.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2017-9287

CWE-ID: CWE-415 - Double Free

Exploit availability: No

Description

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

The vulnerability exists due to a double free error within servers/slapd/back-mdb/search.c when processing search requests, which include the Paged Results control with a page size of 0. A remote authenticated attacker can issue a directory search and crash the slapd daemon.

Successful exploitation of the vulnerability may allow a remote authenticated attacker to perform a denial of service (DoS) attack.

Mitigation

Update to version 2.4.45.

Vulnerable software versions

OpenLDAP: 1.0 - 2.4.44

CPE2.3

• cpe:2.3:a:openldap_org:openldap:1.0:*:*:*:*:*:*:*
• cpe:2.3:a:openldap_org:openldap:1.0.1:*:*:*:*:*:*:*
• cpe:2.3:a:openldap_org:openldap:1.0.2:*:*:*:*:*:*:*

External links

https://www.openldap.org/its/?findid=8655
https://www.openldap.org/devel/gitweb.cgi?p=openldap.git;a=commit;h=0cee1ffb6021b1aae3fcc9581699da1c85a6dd6e
https://www.openldap.org/software/release/changes.html

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

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