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Q1What is this vulnerability? (Essence + Consequences)
π¨ **Essence**: Apache Struts 2.1.x/2.3.x with the **Struts 1 Plugin** has an input validation error.β¦
π‘οΈ **Root Cause**: **Input Validation Error**. The framework fails to properly sanitize field values passed via `ActionMessage` in raw messages.β¦
π’ **Vendor**: Apache Software Foundation. π¦ **Product**: Apache Struts 2. π **Affected Versions**: **2.1.x** and **2.3.x** specifically when the **Struts 1 Plugin** is enabled. π« Notably affects S2-048.
Q4What can hackers do? (Privileges/Data)
π» **Privileges**: **Full Remote Code Execution**. π **Data**: Attackers can execute arbitrary system commands. π **Impact**: Complete compromise of the server, data theft, or lateral movement. π΅οΈββοΈ
Q5Is exploitation threshold high? (Auth/Config)
π **Threshold**: **LOW**. π **Auth**: No authentication required (Remote). βοΈ **Config**: Only requires the Struts 1 plugin to be active. π **Ease**: Exploitable via HTTP headers (Content-Type manipulation).
Q6Is there a public Exp? (PoC/Wild Exploitation)
π₯ **Public Exp**: **YES**. π **PoCs**: Available on GitHub (e.g., `s2-048`, `Struts2-048`). π οΈ **Tools**: Metasploit modules exist. π **Wild Exploitation**: High risk due to simple header-based exploitation. π
π‘οΈ **Official Fix**: **YES**. π **Reference**: Apache Struts advisory S2-048. π **Action**: Upgrade to a patched version of Struts 2 (>= 2.3.32 or 2.5.10). π¦
Q9What if no patch? (Workaround)
π§ **No Patch Workaround**: π« **Disable** the Struts 1 Plugin if not needed. π **WAF**: Block requests with suspicious OGNL patterns in headers. 𧱠**Input Filtering**: Strictly validate multipart form data fields.