Multiple Vulnerabilities in Cisco Jabber Could Allow for Remote Code Execution

Summary

Multiple vulnerabilities have been discovered in Cisco Jabber the most severe of which could allow for arbitrary code execution. Cisco Jabber provides instant messaging (IM), voice, video, voice messaging, desktop sharing, and conferencing on any device. Successful exploitation of the most severe of these vulnerabilities could allow an unauthenticated, remote attacker to execute code on the affected systems . Depending on the privileges associated with the application, an attacker could then install programs; view, change, or delete data; or create new accounts with full user rights. Applications configured to have fewer restrictions on the system could be less impacted than those who operate with elevated privileges.

Threat Intelligence

There are currently no reports of these vulnerabilities being exploited in the wild.

Systems Affected

• Cisco Jabber for Windows 12.1 versions prior to 12.1.4
• Cisco Jabber for Windows 12.5 versions prior to 12.5.3
• Cisco Jabber for Windows 12.6 versions prior to 12.6.4
• Cisco Jabber for Windows 12.7 versions prior to 12.7.3
• Cisco Jabber for Windows 12.8 versions prior to 12.8.4
• Cisco Jabber for Windows 12.9 versions prior to 12.9.3
• Cisco Jabber for MacOS 12.8 versions prior to 12.8.5
• Cisco Jabber for MacOS 12.9 versions prior to 12.9.4
• Cisco Jabber for Android & IOS 12.9 versions prior to 12.9.4

Risk

Government:

• Large and medium government entities: High
• Small government entities: High

Businesses:

• Large and medium business entities: High
• Small business entities: High

Home Users: Low

Technical Details

Multiple vulnerabilities have been discovered in Cisco Jabber, the most severe of which could allow for arbitrary code execution. Details of these vulnerabilities are as follows:

• A vulnerability exists in the application protocol handling features due to improper handling of input that could lead to arbitrary command execution. (CVE-2020-27133)
• A vulnerability exists due to improper validation of message contents. This vulnerability could allow an authenticated, remote attacker to execute arbitrary code. (CVE-2020-26085)
• A vulnerability exists due to improper validation of message contents. This vulnerability could allow an authenticated, remote attacker to inject arbitrary script and potentially execute arbitrary commands on some platforms. (CVE-2020-27134)
• A vulnerability exists due to improper validation of message contents. This vulnerability could allow an authenticated, remote attacker to gain access to sensitive information. (CVE-2020-27132)
• A vulnerability exists in the application protocol handling features due to improper handling of input that could allow an unauthenticated, remote attacker to modify the application configuration. (CVE-2020-27127)

Recommendations

We recommend the following actions be taken:

• Install the update provided by Cisco immediately after appropriate testing.
• Run all software as a non-privileged user (one without administrative privileges) to diminish the effects of a successful attack.
• Remind users not to visit websites or follow links provided by unknown or untrusted sources.
• Inform and educate users regarding the threats posed by hypertext links contained in emails or attachments especially from un-trusted sources.
• Apply the Principle of Least Privilege to all systems and services.

References

Cisco:

• CVE-2020-3430
• CVE-2020-3495
• CVE-2020-3498
• CVE-2020-3537

Reporting

We encourage recipients who discover signs of malicious cyber activity to contact us via the cyber incident report form here.