Symantec Endpoint Protection Privilege Assumption, Policy Bypass, Local Elevation of Privilege

SUMMARY

The Management Console in Symantec Endpoint Protection does not properly validate user authentication, which could potentially allow a user to assume another user's identity and privileges on the console.

Symantec Endpoint Protection clients do not sufficiently restrict custom policies, which could potentially lead to directory/file access by an unauthorized user.

Symantec Endpoint Protection clients have unquoted search paths, which could allow a non-privileged local user to potentially run arbitrary code.

AFFECTED PRODUCTS

Product

|

Version

|

Build

|

Solution(s)

—|—|—|—

Symantec Endpoint Protection

|

11.x

|

All

|

Upgrade to SEP 11.0.7.4 or the latest release of SEP 12.1.x

Symantec Endpoint Protection Small Business Edition

|

12.0

|

All

|

Upgrade to latest release of SEP 12.1.x

Symantec Endpoint Protection

|

12.1.x

|

All prior to 12.1.2 (RU2)

|

Upgrade to latest release of SEP 12.1.x

ISSUES

CVSS2

Base Score

|

Impact

|

Exploitability

|

CVSS2 Vector

—|—|—|—

SEPM Insufficient User Validation Privilege Assumption - Medium

6.3

|

10.0

|

2.0

|

AV:A/AC:H/AU:M/C:C/I:C/A:C

SEP Client ADC Security Policy Bypass Unauthorized File Access - Medium

4.1

|

6.4

|

2.7

|

AV:L/AC:M/AU:S/C:P/I:P/A:P

SEP Client Unquoted Search Path Local Elevation of Privilege - Medium

6.6

|

10.0

|

2.7

|

AV:L/AC:M/AU:S/C:C/I:C/A:C

CVE

|

BID

|

Description

—|—|—

CVE-2013-5009

|

BID 64128

|

SEPM Insufficient User Validation Privilege Assumption

CVE-2013-5010

|

BID 64129

|

SEP Client ADC Security Policy BypassUnauthorized File Access

CVE-2013-5011

|

BID 64130

|

SEP Client Unquoted Search Path Local Elevation of Privilege

MITIGATION

Details

Symantec's Endpoint Protection Manager does not properly validate the authentication of authorized users. This could potentially permit an authorized but limited access administrator to leverage full admin privileged access. Any authorized user who can access a limited admin account could potentially assume the identification and privileges of any other authorized console user to include full admin.

The Application/Device Control (ADC) in Symantec Endpoint Protection clients does not sufficiently enforce some custom polices. An authorized but non-privileged user could potentially bypass restrictions set up via ADC policies and access unauthorized directories/files on a system.

NOTE: This custom policy bypass does not permit a non-privileged user to bypass normal file system permissions (ACLs). A user bypassing custom policy restrictions in this manner will not be able to access files or directories in violation of established ACLs.

Symantec Endpoint Protection clients are susceptible to an unquoted search path issue. This could potentially allow an authorized but non-privileged local user to execute arbitrary code with elevated privileges on the client system. Successful targeting would require the local user to be able to insert their code in the system root path undetected by the OS or other security applications where it could potentially be executed during application startup or reboot. If successful, their code could potentially execute with client application privileges.

Symantec Response
Symantec product engineers verified these issues and resolved them in the Symantec Endpoint Protection releases identified above.

Update Information

Updates are available through customers' normal support/download locations.

Best Practices
As part of normal best practices, Symantec strongly recommends the following:

• Restrict access to administrative or management systems to authorized privileged users.
• Restrict remote access, if required, 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. Run both firewall and anti-malware applications, at a minimum, 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 detection of attacks or malicious activity related to exploitation of latent vulnerabilities

ACKNOWLEDGEMENTS

Symantec thanks Matthew Hembree for the security policy bypass reported in Symantec Endpoint Protection Manager Application/Device Control and for working closely with us as we resolved it.

Symantec credits Jennia Hizver for reporting the user identity and privilege assumption in Symantec Endpoint Protection Manager and for working closely with us as we resolved it.

Symantec credits Anand Bhat and Timothy McKenzie for identifying unquoted search paths in Symantec Endpoint Protection.

REFERENCES

BID: Security Focus, http://www.securityfocus.com, has assigned Bugtraq IDs (BIDs) to these issues for inclusion in the Security Focus vulnerability database.

CVE: These issues are candidates for inclusion in the CVE list (http://cve.mitre.org), which standardizes names for security problems.