CVE-2015-7792
📋 TL;DR
CVE-2015-7792 is an unspecified vulnerability in Corega CG-WLBARGS devices that allows remote attackers to perform administrative operations without authentication. This affects all users of Corega CG-WLBARGS devices with vulnerable firmware versions. Attackers can potentially take full control of affected devices.
💻 Affected Systems
- Corega CG-WLBARGS
📦 What is this software?
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise allowing attacker to reconfigure network settings, intercept traffic, install malware, or use device as pivot point into internal network.
Likely Case
Unauthorized administrative access leading to network configuration changes, DNS hijacking, or device takeover for botnet participation.
If Mitigated
Limited impact if devices are behind firewalls with strict inbound filtering and network segmentation.
🎯 Exploit Status
Vulnerability allows administrative operations without authentication, suggesting simple exploitation vectors.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Firmware update released by Corega
Vendor Advisory: http://corega.jp/support/security/20151224_wlbargs.htm
Restart Required: Yes
Instructions:
1. Download latest firmware from Corega support site. 2. Log into device admin interface. 3. Navigate to firmware update section. 4. Upload and apply new firmware. 5. Reboot device.
🔧 Temporary Workarounds
Network Isolation
allPlace devices behind firewalls with strict inbound filtering to prevent external exploitation.
Access Control Lists
allImplement network ACLs to restrict administrative access to trusted IP addresses only.
🧯 If You Can't Patch
- Replace vulnerable devices with supported models
- Segment affected devices in isolated network zones with no internet access
🔍 How to Verify
Check if Vulnerable:
Check device firmware version via admin interface. If version predates December 2015 patches, device is vulnerable.Check Version:
Check via web admin interface at device IP addressVerify Fix Applied:
Verify firmware version matches or exceeds version specified in Corega advisory. Test administrative functions require authentication.📡 Detection & Monitoring
Log Indicators:
- Unauthorized administrative access attempts
- Configuration changes from unexpected sources
- Failed authentication attempts followed by successful administrative operations
Network Indicators:
- Administrative protocol traffic from unexpected sources
- Unusual configuration changes via network protocols
SIEM Query:
source_ip NOT IN trusted_admin_ips AND (uri CONTAINS '/admin' OR uri CONTAINS '/cgi-bin') AND response_code=200🔗 References
- http://corega.jp/support/security/20151224_wlbargs.htm
- http://jvn.jp/en/jp/JVN51349622/index.html
- http://jvndb.jvn.jp/jvndb/JVNDB-2015-000201
- http://www.securityfocus.com/bid/79683
- http://corega.jp/support/security/20151224_wlbargs.htm
- http://jvn.jp/en/jp/JVN51349622/index.html
- http://jvndb.jvn.jp/jvndb/JVNDB-2015-000201
- http://www.securityfocus.com/bid/79683
