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AUSCERT External Security Bulletin Redistribution
ESB-2018.1609
SAML authentication bypass patched in Symantec ProxySG and
Advanced Secure Gateway
28 May 2018
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AusCERT Security Bulletin Summary
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Product: Symantec Advanced Secure Gateway
Symantec ProxySG
Publisher: Symantec
Operating System: Network Appliance
Impact/Access: Provide Misleading Information -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2018-5241
Original Bulletin:
https://www.symantec.com/security-center/network-protection-security-advisories/SA167
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Security Center / Network Protection Security Advisories / SA167: SAML
Authentication Bypass
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 Number:
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
controls.
Affected Products:
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
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
AuthConnector
BCAAA
CacheFlow
Client Connector
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
Content Analysis
General Auth Connector Login Application
HSM Agent for the Luna SP
IntelligenceCenter
IntelligenceCenter Data Collector
K9
Mail Threat Defense
Malware Analysis
Management Center
PacketShaper
PacketShaper S-Series
PolicyCenter
PolicyCenter S-Series
ProxyAV
ProxyAV ConLog and ConLogXP
ProxyClient
Reporter
SSL Visibility
X-Series XOS
Unified Agent
The following products are under investigation:
Director
Norman Shark Industrial Control System Protection
Security Analytics
Advisory Details:
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.
Patches:
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
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.
References:
Duo Finds SAML Vulnerabilities Affecting Multiple Implementations - https://
duo.com/blog/duo-finds-saml-vulnerabilities-affecting-multiple-implementations
CERT VU#475445 - https://www.kb.cert.org/vuls/id/475445
CVE-2018-5241 - https://nvd.nist.gov/vuln/detail/CVE-2018-5241
Advisory History:
2018-05-23 initial public release
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