Symantec Endpoint Protection Security Update

Summary

Symantec, A Division of Broadcom has released updates to address issues that were discovered in the Symantec Endpoint Protection (SEP) and Symantec Endpoint Protection Manager (SEPM) products.

Affected Product(s)

Symantec Endpoint Protection Manager (SEPM)

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CVE

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Affected Version(s)

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Remediation~~~~

CVE-2020-5833

CVE-2020-5834

CVE-2020-5835

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Prior to 14.3

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Upgrade to 14.3

Symantec Endpoint Protection (SEP)

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CVE

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Affected Version(s)

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Remediation~~~~

CVE-2020-5836

CVE-2020-5837

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Prior to 14.3

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Upgrade to 14.3

Issue Details

**CVE-2020-5833 **

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** Severity/CVSSv3:**

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Low / 3.3 AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

** References:**

** Impact:**

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NVD: CVE-2020-5833

Out of Bounds

** Description:**

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Symantec Endpoint Protection Manager, prior to 14.3, may be susceptible to an out of bounds vulnerability, which is a type of issue that results in an existing application reading memory outside of the bounds of the memory that had been allocated to the program.

**CVE-2020-5834 **

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** Severity/CVSSv3:**

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Medium / 5.3 AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

** References:**

** Impact:**

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NVD: CVE-2020-5834

Directory Traversal

** Description:**

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Symantec Endpoint Protection Manager, prior to 14.3, may be susceptible to a directory traversal attack that could allow a remote actor to determine the size of files in the directory.

**CVE-2020-5835 **

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** Severity/CVSSv3:**

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Medium / 6.7 AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H

** References:**

** Impact:**

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NVD: CVE-2020-5835

Elevation of Privilege

** Description:**

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Symantec Endpoint Protection Manager, prior to 14.3, has a race condition in client remote deployment which may result in an elevation of privilege on the remote machine.

**CVE-2020-5836 **

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** Severity/CVSSv3:**

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Medium / 6.7 AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H

** References:**

** Impact:**

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NVD: CVE-2020-5836

Elevation of Privilege

** Description:**

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Symantec Endpoint Protection (Windows Endpoint), prior to 14.3, can potentially reset the ACLs on a file as a limited user while Symantec Endpoint Protection’s Tamper Protection feature is disabled.

**CVE-2020-5837 **

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** Severity/CVSSv3:**

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High / 7.8 AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

** References:**

** Impact:**

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NVD: CVE-2020-5837

Elevation of Privilege

** Description:**

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Symantec Endpoint Protection (Windows Endpoint), prior to 14.3, may not respect file permissions when writing to log files that are replaced by symbolic links, which can lead to a potential elevation of privilege.

Mitigation & Additional Information

The following product updates have been made available to customers to remediate these issues:

• SEP 14.3
• SEPM 14.3

Symantec has also created additional detections and protections which are in place and is continuing to monitor any attempts of this exploit against our products. At this time, there is no evidence of any attempts at these exploits in the wild.

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 for 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

• CVE-2020-5833: Z0mb1E
• CVE-2020-5834: Z0mb1E
• _CVE-2020-5835: Ilias Dimopoulos of RedyOps Research Labs _
• CVE-2020-5836: Tobias Neitzel and Lars Neumann of usd AG
• _CVE-2020-5837: Ilias Dimopoulos of RedyOps Research Labs _

Detection Signature

• SONAR.SuspLaunch!g119