CVE-2019-1855 Cisco Jabber for Windows DLL Preloading Vulnerability

High 7.3 Published 4 Jul 2019 Updated 20 Nov 2024

A local attacker with valid credentials can execute arbitrary code via DLL preloading in Cisco Jabber for Windows.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Local or same network only
Victim action needed: A user has to click or open something
Fix: None listed

What is CVE-2019-1855?

CVE-2019-1855 is a high-severity code injection vulnerability in Cisco Jabber for Windows, published on 4 Jul 2019. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.

Official description

A vulnerability in the loading mechanism of specific dynamic link libraries in Cisco Jabber for Windows could allow an authenticated, local attacker to perform a DLL preloading attack. To exploit this vulnerability, the attacker would need to have valid credentials on the Windows system. The vulnerability is due to insufficient validation of the resources loaded by the application at run time. An attacker could exploit this vulnerability by crafting a malicious DLL file and placing it in a specific location on the targeted system. The malicious DLL file would execute when the Jabber application launches. A successful exploit could allow the attacker to execute arbitrary code on the target machine with the privileges of another user's account.

Weakness: CWE-427, CWE-264

Which versions are affected by CVE-2019-1855?

It affects 1 product.

Products include Cisco Jabber.

How do I fix CVE-2019-1855?

No fix has been published for CVE-2019-1855 yet. Limit exposure of the affected software until one is available.

Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.

Is CVE-2019-1855 being exploited?

There is no known exploitation of CVE-2019-1855 in the wild and no public exploit code.

Sources

Also known as GHSA-m3pw-gwv9-w25w.