This is a summary of the AI-generated 10-question deep analysis. The full version (longer answers, follow-up Q&A, related CVEs) requires login. Read the full analysis β
Q1What is this vulnerability? (Essence + Consequences)
π¨ **Essence**: Yii2 < 2.0.38 suffers from **Remote Code Execution (RCE)** via unsafe deserialization.β¦
π‘οΈ **Root Cause**: **CWE-502** (Deserialization of Untrusted Data). The framework allows `unserialize()` on user-controlled input, enabling malicious payload execution through gadget chains.
Q3Who is affected? (Versions/Components)
π¦ **Affected**: **Yii2** versions **before 2.0.38**. Specifically, the `yiisoft/yii2` package. Versions 2.0.38+ are patched.
Q4What can hackers do? (Privileges/Data)
π **Attacker Capabilities**: Full **Remote Code Execution (RCE)**. Can run system commands (e.g., `ls`, `cat`), read sensitive files, modify data, and potentially pivot to other internal systems.
Q5Is exploitation threshold high? (Auth/Config)
β‘ **Exploitation Threshold**: **Low**. CVSS indicates **AV:N** (Network), **PR:N** (No Privileges), **UI:N** (No User Interaction). No auth required if the app calls `unserialize()` on input.
Q6Is there a public Exp? (PoC/Wild Exploitation)
π **Public Exploits**: **Yes**. Multiple PoCs available on GitHub (e.g., `CVE-2020-15148-bypasses`, `cve-2020-15148`). Automated scanners like Nuclei also have templates.
Q7How to self-check? (Features/Scanning)
π **Self-Check**: Scan for Yii2 apps using `unserialize()` with user input. Check version numbers. Look for specific gadget chains involving `yii\rest\CreateAction` or `Faker\Generator`.
Q8Is it fixed officially? (Patch/Mitigation)
β **Official Fix**: **Yes**. Patched in **Yii2 version 2.0.38**. Commit `9abccb9` addresses the issue. Upgrade immediately.
Q9What if no patch? (Workaround)
π§ **No Patch Workaround**: **Disable `unserialize()`** on user input. Implement strict input validation. Use allowlists for serialized data. Avoid passing untrusted data to `unserialize()`.
Q10Is it urgent? (Priority Suggestion)
π₯ **Urgency**: **CRITICAL**. High CVSS score, easy exploitation, no auth needed, and public exploits exist. Patch immediately to prevent RCE.