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AUSCERT External Security Bulletin Redistribution
SAML authentication bypass patched in Symantec ProxySG and
Advanced Secure Gateway
28 May 2018
AusCERT Security Bulletin Summary
Product: Symantec Advanced Secure Gateway
Operating System: Network Appliance
Impact/Access: Provide Misleading Information -- Remote/Unauthenticated
CVE Names: CVE-2018-5241
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Security Center / Network Protection Security Advisories / SA167: SAML
SA167: SAML Authentication Bypass
Security Advisory ID: SA167
Published Date: May 25, 2018
Advisory Status: Interim
Advisory Severity: Medium
CVSSv2 base score: 6.4 (AV:N/AC:L/Au:N/C:P/I:P/A:N)
CVE-2018-5241 - 6.4 (MEDIUM) (AV:N/AC:L/Au:N/C:P/I:P/A:N)
When configured to authenticate network users with a SAML authentication realm,
Symantec ASG and ProxySG incorrectly handle SAML responses that have XML nodes
with comments. A remote attacker can modify a valid SAML response without
invalidating its cryptographic signature to bypass SAML authentication security
The following products are vulnerable:
Advanced Secure Gateway
ASG 6.6 and 6.7 are vulnerable when authenticating network users in intercepted
proxy traffic with a SAML authentication realm.
ProxySG 6.5, 6.6, and 6.7 are vulnerable when authenticating network users in
intercepted proxy traffic with a SAML authentication realm.
The following products are not vulnerable:
Android Mobile Agent
Cloud Data Protection for Salesforce
Cloud Data Protection for Salesforce Analytics
Cloud Data Protection for ServiceNow
Cloud Data Protection for Oracle CRM On Demand
Cloud Data Protection for Oracle Field Service Cloud
Cloud Data Protection for Oracle Sales Cloud
Cloud Data Protection Integration Server
Cloud Data Protection Communication Server
Cloud Data Protection Policy Builder
General Auth Connector Login Application
HSM Agent for the Luna SP
IntelligenceCenter Data Collector
Mail Threat Defense
ProxyAV ConLog and ConLogXP
The following products are under investigation:
Norman Shark Industrial Control System Protection
CVE-2018-5241 is a SAML authentication bypass vulnerability in ASG and ProxySG
(CVE-2018-5241). The appliances 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.
Advanced Secure Gateway
ASG 6.7 - a fix is not available at this time.
ASG 6.6 - a fix is not available at this time.
ProxySG 6.7 - a fix is not available at this time.
ProxySG 6.6 - a fix is not available at this time.
ProxySG 6.5 - a fix is not available at this time.
Duo Finds SAML Vulnerabilities Affecting Multiple Implementations - https://
CERT VU#475445 - https://www.kb.cert.org/vuls/id/475445
CVE-2018-5241 - https://nvd.nist.gov/vuln/detail/CVE-2018-5241
2018-05-23 initial public release
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