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Q1What is this vulnerability? (Essence + Consequences)
๐จ **Essence**: Squid Proxy fails to redact HTTP Auth credentials in error messages. ๐ฅ **Consequences**: Severe Information Disclosure.โฆ
๐ก๏ธ **CWE**: CWE-209 (Information Exposure Through an Error Message). ๐ **Flaw**: The software incorrectly handles error states, leaving raw HTTP Authorization headers visible in the response instead of masking them.
Q3Who is affected? (Versions/Components)
๐ฆ **Product**: Squid Proxy Server. ๐ **Affected**: Versions **prior to Squid 7.2**. If you are running 7.1.x or older, you are vulnerable.
Q4What can hackers do? (Privileges/Data)
๐ต๏ธ **Hackers Can**: Bypass browser security protections. ๐ค **Data Stolen**: They can extract valid HTTP Basic Auth credentials or internal security tokens from the error output, potentially gaining unauthorized access.
Q5Is exploitation threshold high? (Auth/Config)
โก **Threshold**: LOW. ๐ **Access**: Network Accessible (AV:N). ๐ซ **Auth**: No Privileges Required (PR:N). ๐ฑ๏ธ **UI**: No User Interaction Needed (UI:N). It is an easy remote exploit.
Q6Is there a public Exp? (PoC/Wild Exploitation)
๐ฅ **Public Exp?**: YES. Multiple PoCs are live on GitHub (e.g., monzaviman, shahroodcert, nehkark). Automated scanners are likely already detecting this.
Q7How to self-check? (Features/Scanning)
๐ **Self-Check**: Trigger an error condition in Squid while using HTTP Auth. ๐ **Inspect**: Look at the error page/response. If you see `Authorization: Basic ...` or similar tokens in plain text, you are vulnerable.
Q8Is it fixed officially? (Patch/Mitigation)
โ **Fixed?**: YES. Official patch available in **Squid 7.2**. ๐ **Commit**: See GitHub commit `0951a0681011dfca3d78c84fd7f1e19c78a4443f` for the fix details.
Q9What if no patch? (Workaround)
๐ง **No Patch?**: Upgrade immediately. If impossible, restrict Squid access to trusted IPs only and monitor logs for error responses containing auth headers. Consider using a WAF to filter sensitive data in responses.
Q10Is it urgent? (Priority Suggestion)
๐ด **Urgency**: HIGH. CVSS Score indicates Critical Impact on Confidentiality and Integrity. With public PoCs, immediate patching to v7.2+ is strongly recommended to prevent credential theft.