CWE-154 (变量名分隔符转义处理不恰当) — Vulnerability Class 1

CWE-154 represents a critical input validation weakness where software fails to properly sanitize special characters that function as variable name delimiters. This flaw typically arises when an application accepts untrusted data from an upstream source and passes it directly to a downstream component, such as a shell or scripting engine, without adequate filtering. Attackers exploit this by injecting malicious delimiters, like dollar signs in shell environments, to trick the parser into interpreting user input as executable code or variable references. This can lead to arbitrary command execution, information disclosure, or unauthorized system modifications. To prevent such attacks, developers must rigorously validate and escape all external inputs before processing. Implementing strict allow-lists for acceptable characters and using parameterized interfaces or safe APIs that inherently handle delimiter escaping are essential strategies to mitigate the risk of unintended code interpretation.