Symantec Web Gateway Management Console Interface Command Injection

SUMMARY

Symantec has released an update to address a Symantec Web Gateway (SWG) Management Console Interface command injection issue bypassing validation restrictions to add an unauthorized whitelist entry.

AFFECTED PRODUCTS

Symantec Web Gateway (SWG)

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CVE

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Affected Version(s)

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Remediation

CVE-2016-5313

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Prior to 5.2.5

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Upgrade to 5.2.5

ISSUES

CVE-2016-5313

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Severity/CVSSv3:

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Medium / 4.8 AV:A/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

References:

Impact:

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Securityfocus: BID 93284 / NVD: CVE-2016-5313

Security bypass

Description:

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The Symantec Web Gateway Management Console allows some specially crafted entries to update the whitelist without validation. A lower-privileged but authorized management console user can bypass the whitelist validation using a specifically-modified script to create an unauthorized whitelist entry. This whitelist entry could potentially be leveraged in further malicious attempts against the network.

MITIGATION

The Symantec Web Gateway management console interface should never be accessible external to the authorized network or by any users other than an authorized management console user

Best Practices

Symantec recommends the following measures to reduce risk of attack:

• Restrict access to administrative or management systems to authorized privileged users.
• Restrict remote access to trusted/authorized systems only.
• Run under the principle of least privilege, where possible, to limit the impact of potential exploit.
• Keep all operating systems and applications current with vendor patches.
• Follow a multi-layered approach to security. At a minimum, run both firewall and anti-malware applications to provide multiple points of detection and protection to both inbound and outbound threats.
• Deploy network and host-based intrusion detection systems to monitor network traffic for signs of anomalous or suspicious activity. This may aid in the detection of attacks or malicious activity related to the exploitation of latent vulnerabilities.

ACKNOWLEDGEMENTS

• Egidio Romano of Karma(In)Security (CVE-2016-5313)