Description
The product does not perform any authentication for functionality that requires a provable user identity or consumes a significant amount of resources.
Potential Impact
Access Control, Other
Gain Privileges or Assume Identity, Varies by Context
Demonstrative Examples
public BankAccount createBankAccount(String accountNumber, String accountType,String accountName, String accountSSN, double balance) {
BankAccount account = new BankAccount();account.setAccountNumber(accountNumber);account.setAccountType(accountType);account.setAccountOwnerName(accountName);account.setAccountOwnerSSN(accountSSN);account.setBalance(balance);
return account;
}private boolean isUserAuthentic = false;
// authenticate user,
// if user is authenticated then set variable to true
// otherwise set variable to false
public boolean authenticateUser(String username, String password) {...}
public BankAccount createNewBankAccount(String accountNumber, String accountType,String accountName, String accountSSN, double balance) {
BankAccount account = null;
if (isUserAuthentic) {account = new BankAccount();account.setAccountNumber(accountNumber);account.setAccountType(accountType);account.setAccountOwnerName(accountName);account.setAccountOwnerSSN(accountSSN);account.setBalance(balance);}return account;
}A security researcher found 86 S3 buckets that could be accessed without authentication (CWE-306) and stored data unencrypted (CWE-312). These buckets exposed over 1000 GB of data and 1.6 million files including physical addresses, phone numbers, tax documents, pictures of driver's license IDs, etc. [REF-1296] [REF-1295]The sensitive information could have been protected by ensuring that the buckets did not have public read access, e.g., by enabling the s3-account-level-public-access-blocks-periodic rule to Block Public Access. In addition, the data could have been encrypted at rest using the appropriate S3 settings, e.g., by enabling server-side encryption using the s3-bucket-server-side-encryption-enabled setting. Other settings are available to further prevent bucket data from being leaked. [REF-1297]Mitigations & Prevention
Divide the software into anonymous, normal, privileged, and administrative areas. Identify which of these areas require a proven user identity, and use a centralized authentication capability. Identify all potential communication channels, or other means of interaction with the software, to ensure that all channels are appropriately protected, including those channels that are assumed to be accessible only by authorized parties. Developers sometimes perform authentication at
For any security checks that are performed on the client side, ensure that these checks are duplicated on the server side, in order to avoid CWE-602. Attackers can bypass the client-side checks by modifying values after the checks have been performed, or by changing the client to remove the client-side checks entirely. Then, these modified values would be submitted to the server.
Where possible, avoid implementing custom, "grow-your-own" authentication routines and consider using authentication capabilities as provided by the surrounding framework, operating system, or environment. These capabilities may avoid common weaknesses that are unique to authentication; support automatic auditing and tracking; and make it easier to provide a clear separation between authentication tasks and authorization tasks. In environments such as the World Wide Web, the
Use a vetted library or framework that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid. For example, consider using libraries with authentication capabilities such as OpenSSL or the ESAPI Authenticator [REF-45].
When storing data in the cloud (e.g., S3 buckets, Azure blobs, Google Cloud Storage, etc.), use the provider's controls to require strong authentication for users who should be allowed to access the data [REF-1297] [REF-1298] [REF-1302].
Detection Methods
- Manual Analysis — This weakness can be detected using tools and techniques that require manual (human) analysis, such as penetration testing, threat modeling, and interactive tools that allow the tester to record and modify an active session. Specifically, manual static analysis is useful for eval
- Automated Static Analysis Limited — Automated static analysis is useful for detecting commonly-used idioms for authentication. A tool may be able to analyze related configuration files, such as .htaccess in Apache web servers, or detect the usage of commonly-used authentication libraries. Generally, automated stati
- Manual Static Analysis - Binary or Bytecode SOAR Partial — According to SOAR [REF-1479], the following detection techniques may be useful:
- Dynamic Analysis with Automated Results Interpretation SOAR Partial — According to SOAR [REF-1479], the following detection techniques may be useful:
- Dynamic Analysis with Manual Results Interpretation SOAR Partial — According to SOAR [REF-1479], the following detection techniques may be useful:
- Manual Static Analysis - Source Code SOAR Partial — According to SOAR [REF-1479], the following detection techniques may be useful:
Real-World CVE Examples
| CVE ID | Description |
|---|---|
| CVE-2024-11680 | File-sharing PHP product does not check if user is logged in during requests for PHP library files under an includes/ directory, allowing configuration changes, code execution, and other impacts. |
| CVE-2022-31260 | Chain: a digital asset management program has an undisclosed backdoor in the legacy version of a PHP script (CWE-912) that could allow an unauthenticated user to export metadata (CWE-306) |
| CVE-2022-29951 | TCP-based protocol in Programmable Logic Controller (PLC) has no authentication. |
| CVE-2022-29952 | Condition Monitor firmware uses a protocol that does not require authentication. |
| CVE-2022-30276 | SCADA-based protocol for bridging WAN and LAN traffic has no authentication. |
| CVE-2022-30313 | Safety Instrumented System uses proprietary TCP protocols with no authentication. |
| CVE-2022-30317 | Distributed Control System (DCS) uses a protocol that has no authentication. |
| CVE-2021-21972 | Chain: Cloud computing virtualization platform does not require authentication for upload of a tar format file (CWE-306), then uses .. path traversal sequences (CWE-23) in the file to access unexpecte |
| CVE-2020-10263 | Bluetooth speaker does not require authentication for the debug functionality on the UART port, allowing root shell access |
| CVE-2021-23147 | WiFi router does not require authentication for its UART port, allowing adversaries with physical access to execute commands as root |
| CVE-2021-37415 | IT management product does not perform authentication for some REST API requests, as exploited in the wild per CISA KEV. |
| CVE-2020-13927 | Default setting in workflow management product allows all API requests without authentication, as exploited in the wild per CISA KEV. |
| CVE-2002-1810 | MFV. Access TFTP server without authentication and obtain configuration file with sensitive plaintext information. |
| CVE-2008-6827 | Agent software running at privileges does not authenticate incoming requests over an unprotected channel, allowing a Shatter" attack. |
| CVE-2004-0213 | Product enforces restrictions through a GUI but not through privileged APIs. |
Showing 15 of 17 observed examples.
Related Weaknesses
Taxonomy Mappings
- PLOVER: — No Authentication for Critical Function
- Software Fault Patterns: SFP31 — Missing authentication
- ISA/IEC 62443: Part 4-2 — Req CR 1.1
- ISA/IEC 62443: Part 4-2 — Req CR 1.2
- ISA/IEC 62443: Part 4-2 — Req CR 2.1
- ISA/IEC 62443: Part 4-1 — Req SR-2
- ISA/IEC 62443: Part 4-1 — Req SVV-3
Frequently Asked Questions
What is CWE-306?
CWE-306 (Missing Authentication for Critical Function) is a software weakness identified by MITRE's Common Weakness Enumeration. It is classified as a Base-level weakness. The product does not perform any authentication for functionality that requires a provable user identity or consumes a significant amount of resources.
How can CWE-306 be exploited?
Attackers can exploit CWE-306 (Missing Authentication for Critical Function) to gain privileges or assume identity, varies by context. This weakness is typically introduced during the Architecture and Design, Architecture and Design, Operation phase of software development.
How do I prevent CWE-306?
Key mitigations include: Divide the software into anonymous, normal, privileged, and administrative areas. Identify which of these areas require a proven user identity, and use a centralized authentication capability.
What is the severity of CWE-306?
CWE-306 is classified as a Base-level weakness (Medium abstraction). It has been observed in 17 real-world CVEs.