CVE-2022-31799
📋 TL;DR
CVE-2022-31799 is a critical vulnerability in Bottle web framework where improper error handling during early request binding can lead to remote code execution. This affects all applications using Bottle versions before 0.12.20 that process untrusted HTTP requests. Attackers can exploit this to execute arbitrary code on vulnerable servers.
💻 Affected Systems
- Bottle Python web framework
📦 What is this software?
Bottle by Bottlepy
Fedora by Fedoraproject
Fedora by Fedoraproject
⚠️ Risk & Real-World Impact
Worst Case
Remote attacker gains full control of the server, allowing data theft, system compromise, and lateral movement within the network.
Likely Case
Remote code execution leading to web application compromise, data exfiltration, and potential ransomware deployment.
If Mitigated
Limited impact with proper network segmentation, WAF protection, and minimal privileges, though risk remains significant.
🎯 Exploit Status
Exploitation requires sending specially crafted HTTP requests to vulnerable endpoints.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 0.12.20 and later
Vendor Advisory: https://github.com/bottlepy/bottle/security/advisories
Restart Required: Yes
Instructions:
1. Update Bottle: pip install --upgrade bottle>=0.12.20
2. Restart all Bottle applications
3. Verify no older versions remain in dependencies
🔧 Temporary Workarounds
Web Application Firewall (WAF)
allDeploy WAF rules to block malicious HTTP requests targeting Bottle error handling
Reverse Proxy Filtering
linuxConfigure nginx/apache to filter suspicious request patterns before reaching Bottle
# nginx example: limit request sizes and validate headers
🧯 If You Can't Patch
- Isolate vulnerable applications in restricted network segments
- Implement strict network access controls and monitor for exploitation attempts
🔍 How to Verify
Check if Vulnerable:
Check Bottle version: python -c "import bottle; print(bottle.__version__)" and compare to 0.12.20Check Version:
python -c "import bottle; print('Bottle version:', bottle.__version__)"Verify Fix Applied:
Confirm version >=0.12.20 and test application functionality with normal requests📡 Detection & Monitoring
Log Indicators:
- Unusual error messages in Bottle logs
- HTTP requests causing 500 errors with stack traces
- Requests with malformed headers or parameters
Network Indicators:
- HTTP requests with specially crafted headers to trigger errors
- Unusual traffic patterns to Bottle endpoints
SIEM Query:
source="bottle.log" AND ("error" OR "exception") AND "request" | stats count by src_ip🔗 References
- https://github.com/bottlepy/bottle/commit/a2b0ee6bb4ce88895429ec4aca856616244c4c4c
- https://github.com/bottlepy/bottle/commit/e140e1b54da721a660f2eb9d58a106b7b3ff2f00
- https://github.com/bottlepy/bottle/compare/0.12.19...0.12.20
- https://lists.debian.org/debian-lts-announce/2022/06/msg00010.html
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IE7U6J45PUEXIYYVWJKPM6QXIRKDK4HD/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/KTLOQGMDZEPIYTFC2G53OQV2ULCGYS3F/
- https://www.debian.org/security/2022/dsa-5159
- https://github.com/bottlepy/bottle/commit/a2b0ee6bb4ce88895429ec4aca856616244c4c4c
- https://github.com/bottlepy/bottle/commit/e140e1b54da721a660f2eb9d58a106b7b3ff2f00
- https://github.com/bottlepy/bottle/compare/0.12.19...0.12.20
- https://lists.debian.org/debian-lts-announce/2022/06/msg00010.html
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IE7U6J45PUEXIYYVWJKPM6QXIRKDK4HD/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/KTLOQGMDZEPIYTFC2G53OQV2ULCGYS3F/
- https://www.debian.org/security/2022/dsa-5159
