Symantec Advanced Secure Gateway (ASG) 6.6 and 6.7, and ProxySG 6.5, 6.6, and 6.7 are…
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- No fix listed
Attack profile from CVSS 3.0 · NVD. Fix status from CNA.
Summary
Symantec Advanced Secure Gateway (ASG) 6.6 and 6.7, and ProxySG 6.5, 6.6, and 6.7 are susceptible to a SAML authentication bypass vulnerability. The products can be configured with a SAML authentication realm to authenticate network users in intercepted proxy traffic. When parsing SAML responses, ASG and ProxySG incorrectly handle XML nodes with comments. A remote attacker can modify a valid SAML response without invalidating its cryptographic signature. This may allow the attacker to bypass user authentication security controls in ASG and ProxySG. This vulnerability only affects authentication of network users in intercepted traffic. It does not affect administrator user authentication for the ASG and ProxySG management consoles.
Why it matters now
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Symantec | Advanced Secure Gateway (ASG) | 6.6; 6.7 | — | No fix listed | CNA |
| Symantec | ProxySG | 6.5; 6.6; 6.7 | — | No fix listed | CNA |
- Advanced Secure Gateway (ASG) VendorSymantec Affected 6.6; 6.7 Fixed in — No fix listed CNA
- ProxySG VendorSymantec Affected 6.5; 6.6; 6.7 Fixed in — No fix listed CNA
CPE configurations NVD · 5
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:broadcom:advanced_secure_gateway:6.6:*:*:*:*:*:*:* | 6.6 | Vulnerable | Broadcom |
| cpe:2.3:a:broadcom:advanced_secure_gateway:6.7:*:*:*:*:*:*:* | 6.7 | Vulnerable | Broadcom |
| cpe:2.3:a:broadcom:symantec_proxysg:6.5:*:*:*:*:*:*:* | 6.5 | Vulnerable | Broadcom |
| cpe:2.3:a:broadcom:symantec_proxysg:6.6:*:*:*:*:*:*:* | 6.6 | Vulnerable | Broadcom |
| cpe:2.3:a:broadcom:symantec_proxysg:6.7:*:*:*:*:*:*:* | 6.7 | Vulnerable | Broadcom |
- cpe:2.3:a:broadcom:advanced_secure_gateway:6.6:*:*:*:*:*:*:* Versions 6.6 Vulnerable ·Broadcom
- cpe:2.3:a:broadcom:advanced_secure_gateway:6.7:*:*:*:*:*:*:* Versions 6.7 Vulnerable ·Broadcom
- cpe:2.3:a:broadcom:symantec_proxysg:6.5:*:*:*:*:*:*:* Versions 6.5 Vulnerable ·Broadcom
- cpe:2.3:a:broadcom:symantec_proxysg:6.6:*:*:*:*:*:*:* Versions 6.6 Vulnerable ·Broadcom
- cpe:2.3:a:broadcom:symantec_proxysg:6.7:*:*:*:*:*:*:* Versions 6.7 Vulnerable ·Broadcom
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2018-5241
- 2026-10-03 Alias added: GHSA-vf9c-2j2h-8frq
References
More Symantec vulnerabilities
- TI-2017-04157 Command injection in Symantec Messaging Gateway KEVCVSS 3.1HIGH 8.8
- TI-2009-01353 The Intel LANDesk Common Base Agent (CBA) in Symantec Alert Management System 2 (AMS2)… CVSS 2.0HIGH 10.0
- TI-2017-04156 The Symantec Messaging Gateway can encounter an issue of remote code execution, which… CVSS 3.0CRITICAL 10.0
- TI-2012-00284 The management GUI in Symantec Web Gateway 5.0.x before 5.0.3 does not properly restrict… CVSS 2.0HIGH 10.0
- TI-2006-02539 Stack-based buffer overflow in Symantec Antivirus 10.1 and Client Security 3.1 allows… CVSS 2.0HIGH 10.0
- TI-2012-02563 The management console in Symantec Web Gateway 5.0.x before 5.0.3.18 allows remote… CVSS 2.0HIGH 10.0
Sources
- CVE-2018-5241 · CVE Program
- CVE-2018-5241 · NVD
- FIRST EPSS
- GHSA-vf9c-2j2h-8frq · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences