CVE-2025-5400: Chaitak-gorai Blogbook SQLi Vulnerability

CVE-2025-5400 Overview

CVE-2025-5400 is a SQL injection vulnerability in chaitak-gorai Blogbook, an open-source PHP blogging application. The flaw resides in the /user.php script, where the u_id GET parameter is concatenated into a SQL query without sanitization. Attackers can manipulate the parameter remotely without authentication to inject arbitrary SQL statements. The vulnerability was disclosed publicly on VulDB and GitHub, and the vendor did not respond to disclosure attempts. Blogbook uses a rolling release model, so no fixed version is published. The issue is tracked under [CWE-89] (SQL Injection) and [CWE-74] (Injection).

Critical Impact
Unauthenticated remote attackers can inject SQL through the u_id parameter in /user.php, exposing the underlying database to read, write, or enumeration attacks.

Affected Products

chaitak-gorai Blogbook (rolling release up to commit 92f5cf90f8a7e6566b576fe0952e14e1c6736513)
All deployments exposing /user.php to the network
Forks or derivatives inheriting the vulnerable u_id handler

Discovery Timeline

2025-06-01 - CVE-2025-5400 published to NVD
2025-11-10 - Last updated in NVD database

Technical Details for CVE-2025-5400

Vulnerability Analysis

The vulnerability stems from improper neutralization of special elements used in a SQL command. The /user.php endpoint accepts a u_id GET parameter intended to identify a user record. Application logic interpolates the parameter directly into a SQL statement without parameterized queries, prepared statements, or input validation.

Attackers supply crafted payloads through the u_id value to break out of the original query context. Successful injection allows reading database contents, modifying records, or enumerating schema details. Because the endpoint is reachable over the network and requires no authentication, exploitation is straightforward.

The vendor has not acknowledged the report. Blogbook ships as a rolling release on GitHub, so no patched version identifier exists. Administrators must apply manual code changes or remove the affected file from production.

Root Cause

The root cause is direct concatenation of untrusted user input into SQL queries inside /user.php. The code path handling u_id does not apply prepared statements via PDO or mysqli_prepare, nor does it cast or whitelist the parameter. This matches [CWE-89] patterns common in legacy PHP applications.

Attack Vector

An attacker issues an HTTP GET request to /user.php?u_id=<payload> containing SQL metacharacters. The payload terminates the original SQL clause and appends arbitrary statements such as UNION SELECT queries or boolean-based blind injection probes. No session, cookie, or CSRF token is required. Public technical details are available in the GitHub SQL Injection Report and VulDB CTI Entry #310740.

// No verified exploit code is reproduced here.
// See the linked GitHub report for proof-of-concept payloads.

Detection Methods for CVE-2025-5400

Indicators of Compromise

HTTP access log entries containing /user.php?u_id= with SQL metacharacters such as ', --, UNION, SELECT, SLEEP(, or INFORMATION_SCHEMA
Unexpected 500-level responses or database error strings returned from /user.php
Outbound database queries referencing users or schema metadata originating from the Blogbook process
Sudden spikes in request volume to /user.php from a single source address

Detection Strategies

Deploy web application firewall (WAF) rules that inspect the u_id parameter for SQL syntax tokens
Enable MySQL or MariaDB general query logging temporarily to capture anomalous statements originating from the Blogbook PHP process
Correlate web access logs with database audit logs to identify injection attempts that reach the backend

Monitoring Recommendations

Alert on repeated requests to /user.php with non-numeric u_id values when the application expects integers
Monitor for time-delay patterns indicative of blind SQL injection, such as response times exceeding normal baselines
Track egress traffic from the database server for unusual data volumes that suggest dump activity

How to Mitigate CVE-2025-5400

Immediate Actions Required

Restrict public access to /user.php using network controls or authentication proxies until a code fix is deployed
Audit the Blogbook codebase and replace string concatenation in SQL queries with prepared statements using PDO or mysqli parameter binding
Validate that u_id is strictly numeric using intval() or filter_var($u_id, FILTER_VALIDATE_INT) before use in queries
Review database accounts used by the application and remove unnecessary privileges such as FILE or schema-wide write access

Patch Information

No official patch is available. The vendor did not respond to disclosure, and Blogbook uses a rolling release model without versioned releases. Operators must fork the repository, apply parameterized query fixes manually, and redeploy. Track upstream changes at the Blogbook GitHub repository and review the GitHub SQL Injection Report for technical specifics.

Workarounds

Place the application behind a WAF with signatures for SQL injection targeting the u_id parameter
Implement input validation middleware that rejects non-integer u_id values before they reach user.php
Apply least-privilege database credentials so a successful injection cannot escalate beyond read-only access
Consider replacing Blogbook with an actively maintained blogging platform if the vendor remains unresponsive

bash

# Example nginx rule to block non-numeric u_id values
location = /user.php {
    if ($arg_u_id !~ "^[0-9]+$") {
        return 403;
    }
    include fastcgi_params;
    fastcgi_pass unix:/var/run/php-fpm.sock;
}