LDAP injection in SolarWinds Serv-U

1) LDAP injection

EUVDB-ID: #VU59659

Risk: Low

CVSSv3.1: 5.1 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N/E:H/RL:O/RC:C]

CVE-ID: CVE-2021-35247

CWE-ID: CWE-90 - Improper Neutralization of Special Elements used in an LDAP Query ('LDAP Injection')

Exploit availability: No

Description

The vulnerability allows a remote attacker to send unexpected characters to the LDAP server.

The vulnerability exists due to improper input validation when processing DLAP queries in Serv-U web login screen. A remote non-authenticated attacker can send a specially crafted request that can bypass implemented filtration and influence the initial LDAP query.

Note: No downstream affect has been detected as the LDAP servers ignored improper characters.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Serv-U FTP Server: 15.1 - 15.2.5

External links

http://www.solarwinds.com/trust-center/security-advisories/cve-2021-35247

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker 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?

Yes. This vulnerability is being exploited in the wild.