CVE-2022-26136
📋 TL;DR
This vulnerability allows remote unauthenticated attackers to bypass Servlet Filters in multiple Atlassian products, potentially leading to authentication bypass and cross-site scripting attacks. Organizations using affected versions of Atlassian Bamboo, Bitbucket, Confluence, Crowd, Fisheye, Crucible, Jira, and Jira Service Management are at risk. The vulnerability has a CVSS score of 9.8, indicating critical severity.
💻 Affected Systems
- Atlassian Bamboo
- Atlassian Bitbucket
- Atlassian Confluence
- Atlassian Crowd
- Atlassian Fisheye
- Atlassian Crucible
- Atlassian Jira
- Atlassian Jira Service Management
📦 What is this software?
Bamboo by Atlassian
Bamboo by Atlassian
Bamboo by Atlassian
Bamboo by Atlassian
Bitbucket by Atlassian
Bitbucket by Atlassian
Bitbucket by Atlassian
Bitbucket by Atlassian
Bitbucket by Atlassian
Bitbucket by Atlassian
Bitbucket by Atlassian
Crowd by Atlassian
Crowd by Atlassian
Crowd by Atlassian
Crucible by Atlassian
Fisheye by Atlassian
Jira Server by Atlassian
Jira Server by Atlassian
Jira Server by Atlassian
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise through authentication bypass allowing unauthorized access to sensitive data, administrative functions, and potential remote code execution depending on filter configurations.
Likely Case
Authentication bypass leading to unauthorized access to restricted areas and data exposure, with potential cross-site scripting attacks against users.
If Mitigated
Limited impact if proper network segmentation, web application firewalls, and additional authentication layers are in place.
🎯 Exploit Status
The vulnerability requires no authentication and has low attack complexity, making it attractive for exploitation.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: See Atlassian security advisories for specific product versions
Vendor Advisory: https://confluence.atlassian.com/security/security-advisories
Restart Required: Yes
Instructions:
1. Identify affected product and version. 2. Check Atlassian security advisory for specific fixed versions. 3. Backup data and configuration. 4. Apply the security update. 5. Restart the service. 6. Verify the update was successful.
🔧 Temporary Workarounds
Network Access Restriction
allRestrict network access to affected systems to trusted IP addresses only
Use firewall rules to limit access: iptables -A INPUT -p tcp --dport [PORT] -s [TRUSTED_IP] -j ACCEPT
iptables -A INPUT -p tcp --dport [PORT] -j DROP
Web Application Firewall
allDeploy WAF with rules to detect and block filter bypass attempts
🧯 If You Can't Patch
- Isolate affected systems in a segmented network with strict access controls
- Implement additional authentication layers such as VPN or reverse proxy with authentication
🔍 How to Verify
Check if Vulnerable:
Check your Atlassian product version against the affected version ranges in the CVE descriptionCheck Version:
Check product-specific documentation. For Confluence: Check Admin > General Configuration. For Jira: Check Administration > System > System Info.Verify Fix Applied:
Verify the installed version matches or exceeds the fixed versions specified in Atlassian security advisories📡 Detection & Monitoring
Log Indicators:
- Unusual authentication bypass patterns
- Requests that should be filtered but are processed
- Increased failed authentication attempts followed by successful access
Network Indicators:
- Unusual traffic patterns to Servlet endpoints
- Requests attempting to bypass expected filter sequences
SIEM Query:
source="atlassian_logs" AND (event_type="authentication_bypass" OR message="filter bypass" OR status="200" AND auth="failed" in previous events)🔗 References
- https://jira.atlassian.com/browse/BAM-21795
- https://jira.atlassian.com/browse/BSERV-13370
- https://jira.atlassian.com/browse/CONFSERVER-79476
- https://jira.atlassian.com/browse/CRUC-8541
- https://jira.atlassian.com/browse/CWD-5815
- https://jira.atlassian.com/browse/FE-7410
- https://jira.atlassian.com/browse/JRASERVER-73897
- https://jira.atlassian.com/browse/JSDSERVER-11863
- https://jira.atlassian.com/browse/BAM-21795
- https://jira.atlassian.com/browse/BSERV-13370
- https://jira.atlassian.com/browse/CONFSERVER-79476
- https://jira.atlassian.com/browse/CRUC-8541
- https://jira.atlassian.com/browse/CWD-5815
- https://jira.atlassian.com/browse/FE-7410
- https://jira.atlassian.com/browse/JRASERVER-73897
- https://jira.atlassian.com/browse/JSDSERVER-11863
