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CVE-2018-5241

UnknownEPSS 4.80%

Last modified

CVE-2018-5241 is a vulnerability of currently unknown severity. 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. EPSS estimates a 4.80% chance of exploitation in the next 30 days.

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.

Metrics

EPSS Probability
4.80%

90.8th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

VendorProductVersions
BroadcomAdvanced Secure Gateway6.6
BroadcomAdvanced Secure Gateway6.7
BroadcomSymantec Proxysg6.5
BroadcomSymantec Proxysg6.6
BroadcomSymantec Proxysg6.7

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is 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 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.
How severe is CVE-2018-5241?
Severity scoring for CVE-2018-5241 is pending analysis. The EPSS model estimates a 4.80% probability of exploitation in the next 30 days.
How do I fix CVE-2018-5241?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST