CWE-923 Improper Restriction of Communication Channel to Intended Endpoints

The product establishes a communication channel to (or from) an endpoint for privileged or protected operations, but it does not properly ensure that it is communicating with the correct endpoint.

While this issue frequently involves authentication between network-based clients and servers, other types of communication channels and endpoints can have this weakness.

• Integrity, Confidentiality: Gain Privileges or Assume Identity — Attackers might be able to spoof the intended endpoint from a different system or process, thus gaining the same level of access as the intended endpoint. The attacker could gains all the privileges that were intended for the original endpoint.

• Automated Static Analysis: Automated static analysis, commonly referred to as Static Application Security Testing (SAST), can find some instances of this weakness by analyzing source code (or binary/compiled code) without having to execute it. Typically, this is done by building a model of data flow and control flow, then searching for potentially-vulnerable patterns that connect "sources" (origins of input) with "sinks" (destinations where the data interacts with external components, a lower layer such as the OS, etc.)

• CVE-2022-30319: S-bus functionality in a home automation product performs access control using an IP allowlist, which can be bypassed by a forged IP address. • CVE-2022-22547: A troubleshooting tool exposes a web server on a random port between 9000-65535 that could be used for information gathering • CVE-2022-4390: A WAN interface on a router has firewall restrictions enabled for IPv4, but it does not for IPv6, which is enabled by default • CVE-2012-2292: Product has a Silverlight cross-domain policy that does not restrict access to another application, which allows remote attackers to bypass the Same Origin Policy. • CVE-2012-5810: Mobile banking application does not verify hostname, leading to financial loss. • CVE-2014-1266: Chain: incorrect "goto" in Apple SSL product bypasses certificate validation, allowing Adversary-in-the-Middle (AITM) attack (Apple "goto fail" bug). CWE-705 (Incorrect Control Flow Scoping) -> CWE-561 (Dead Code) -> CWE-295 (Improper Certificate Validation) -> CWE-393 (Return of Wrong Status Code) -> CWE-300 (Channel Accessible by Non-Endpoint). The code's whitespace indentation did not reflect the actual control flow (CWE-1114) and did not explicitly delimit the block (CWE-483), which could have made it more difficult for human code auditors to detect the vulnerability. • CVE-2000-1218: DNS server can accept DNS updates from hosts that it did not query, leading to cache poisoning