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Q1What is this vulnerability? (Essence + Consequences)
๐ก๏ธ **Root Cause**: Improper sanitization of input values. The framework fails to validate prefixes before evaluating them as OGNL expressions against the value stack.โฆ
๐ฆ **Affected**: Apache Struts 2. ๐ **Versions**: 2.0.0 through 2.3.15. ๐ซ **Safe**: Versions >= 2.3.15.1 are patched. โ ๏ธ Note: Struts 1 is NOT affected.
Q4What can hackers do? (Privileges/Data)
๐ป **Privileges**: Full system control equivalent to the web server process. ๐ **Data**: Read/Write arbitrary files, execute system commands, steal sensitive data.โฆ
๐ **Auth**: Low. Remote attackers can exploit this without authentication. โ๏ธ **Config**: Requires the vulnerable parameter to be passed to the Struts action. ๐ **Network**: Exploitable over the network (Remote).
Q6Is there a public Exp? (PoC/Wild Exploitation)
๐ฅ **Exploit**: YES. Public PoCs exist on GitHub (e.g., `nth347/CVE-2013-2251`). ๐ก **Automation**: Nuclei templates available for mass scanning.โฆ
๐ **Check**: Scan for Struts 2 versions < 2.3.15.1. ๐งช **Test**: Send requests with `action:ognl_expression` or `redirect:ognl_expression` in parameters.โฆ
โ **Fixed**: YES. Official patch released in version **2.3.15.1**. ๐ **Action**: Upgrade Apache Struts 2 to 2.3.15.1 or later immediately. ๐ **Source**: Apache Security Advisories confirm the fix.
Q9What if no patch? (Workaround)
๐ก๏ธ **Workaround**: If patching is impossible, implement strict WAF rules to block parameters containing `action:`, `redirect:`, or `redirectAction:`. ๐ซ **Filter**: Sanitize input to prevent OGNL prefix injection.โฆ
๐จ **Urgency**: CRITICAL. ๐ **Age**: Published 2013, but still affects legacy systems. โ๏ธ **Priority**: High. RCE vulnerabilities are top-priority. Patch immediately to prevent server takeover. ๐ฅ