Detections
Analytics

LDAP Injection Authentication Bypass

high Web App Scanning Plugin ID 113331

Language:

Synopsis

LDAP Injection Authentication Bypass

Description

Lightweight Directory Access Protocol (LDAP) is used by web applications to access and maintain directory information services.

One of the most common uses for LDAP is to provide a Single-Sign-On (SSO) service that will allow clients to authenticate with a web site without any interaction (assuming their credentials have been validated by the SSO provider).

LDAP injection occurs when untrusted data is used by the web application to query the LDAP directory without prior sanitisation.

This is a serious security risk, as it could allow cyber-criminals the ability to query, modify, or remove anything from the LDAP tree. It could also allow other advanced injection techniques that perform other more serious attacks.

Scanner was able to detect a page that is vulnerable to LDAP injection based on known error messages.

This injection was detected as scanner was able to bypass the authentication mechanism and access an authenticated page.

Solution

It is recommended that untrusted data is never used to form a LDAP query.
To validate data, the application should ensure that the supplied value contains only the characters that are required to perform the required action. For example, where a username is required, then no non-alphanumeric characters should be accepted.
If this is not possible, special characters should be escaped so they are treated accordingly. The following characters should be escaped with a `\`:
* `&` * `!` * `|` * `=` * `<` * `>` * `,` * `+` * `-` * `'` * `'` * `;`
Additional character filtering must be applied to:
* `(` * `)` * `\` * `/` * `*` * `NULL`
These characters require ASCII escaping.

See Also

http://projects.webappsec.org/w/page/13246947/LDAP-Injection

https://www.owasp.org/index.php/LDAP_injection

Plugin Details

Severity: High

ID: 113331

Type: remote

Family: Injection

Published: 8/8/2022

Updated: 7/6/2023

Scan Template: pci, scan

Risk Information

VPR

Risk Factor: Medium

Score: 4.7

CVSS v2

Risk Factor: High

Base Score: 9

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:P/A:P

CVSS Score Source: Tenable

CVSS v3

Risk Factor: High

Base Score: 8.6

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L

CVSS Score Source: Tenable

CVSS v4

Risk Factor: High

Base Score: 7.2

Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:L/VA:L/SC:L/SI:L/SA:L

CVSS Score Source: Tenable

Reference Information