CVE-2023-26132
📋 TL;DR
CVE-2023-26132 is a prototype pollution vulnerability in the dottie JavaScript library that allows attackers to modify object prototypes, potentially leading to denial of service, remote code execution, or privilege escalation. This affects any application using dottie versions before 2.0.4 for object manipulation. The vulnerability is exploitable via the set() function when processing untrusted input.
💻 Affected Systems
- dottie JavaScript library
📦 What is this software?
Dottie by Dottie Project
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete system compromise, data exfiltration, or persistent backdoor installation.
Likely Case
Denial of service through application crashes or modification of application behavior leading to data corruption.
If Mitigated
Limited impact if input validation and sanitization are implemented, though prototype pollution could still affect application stability.
🎯 Exploit Status
Exploitation requires the application to process attacker-controlled input through dottie's set() function. Public proof-of-concept code is available in security advisories.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 2.0.4
Vendor Advisory: https://github.com/mickhansen/dottie.js/commit/7d3aee1c9c3c842720506e131de7e181e5c8db68
Restart Required: Yes
Instructions:
1. Update package.json to specify dottie version 2.0.4 or higher. 2. Run 'npm update dottie' or 'yarn upgrade dottie'. 3. Restart the application to load the patched version.
🔧 Temporary Workarounds
Input validation and sanitization
allImplement strict input validation to reject any input containing '__proto__', 'constructor', or 'prototype' strings.
Object.freeze on prototypes
allFreeze Object.prototype and other critical prototypes to prevent modification.
Object.freeze(Object.prototype);
Object.freeze(Function.prototype);
🧯 If You Can't Patch
- Implement strict input validation to reject any keys containing '__proto__', 'constructor', or 'prototype'
- Use alternative libraries for object manipulation that are not vulnerable to prototype pollution
🔍 How to Verify
Check if Vulnerable:
Check package.json or run 'npm list dottie' to see installed version. If version is below 2.0.4, the system is vulnerable.Check Version:
npm list dottie | grep dottieVerify Fix Applied:
After updating, verify the installed version is 2.0.4 or higher using 'npm list dottie' and test that the set() function rejects prototype pollution attempts.📡 Detection & Monitoring
Log Indicators:
- Unusual application crashes or errors related to object manipulation
- Suspicious input containing '__proto__', 'constructor', or 'prototype' strings in logs
Network Indicators:
- HTTP requests containing '__proto__', 'constructor', or 'prototype' in parameters or payloads
SIEM Query:
source=application_logs AND ("__proto__" OR "constructor" OR "prototype") AND ("dottie" OR "set()")🔗 References
- https://github.com/mickhansen/dottie.js/blob/b48e22714aae4489ea6276452f22cc61980ba5a4/dottie.js%23L107
- https://github.com/mickhansen/dottie.js/commit/7d3aee1c9c3c842720506e131de7e181e5c8db68
- https://security.snyk.io/vuln/SNYK-JS-DOTTIE-3332763
- https://github.com/mickhansen/dottie.js/blob/b48e22714aae4489ea6276452f22cc61980ba5a4/dottie.js%23L107
- https://github.com/mickhansen/dottie.js/commit/7d3aee1c9c3c842720506e131de7e181e5c8db68
- https://security.snyk.io/vuln/SNYK-JS-DOTTIE-3332763
