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Here are just some of the features available to you when using Jabber. With your computer or a mobile device - and an Internet connection - you can instant message, place voice and video calls, share your desktop, conference, and more. Stanford’s Jabber service gives you that while simultaneously simplifying and unifying your communications with your colleagues. So having access to the communication channels you need from anywhere is a requirement to stay productive.
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exe file and force the victim to accept it using an XSS attack," explained Thoresen. "Since Cisco Jabber supports file transfers, an attacker can initiate a file transfer containing a malicious.
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While the embedded browser is sandboxed to prevent access to files and performing system calls, he notes developers create ways to bypass the sandbox to add functionality, in this case to allow the client to open files received from other Cisco Jabber users. Attackers can do this manually on their own machine or it can be automated to create a worm that spreads automatically." A malicious message can therefore easily be created by intercepting an XMPP message sent by the application and modifying it. "Cisco Jabber uses XHTML-IM by default for all messages. The application does not properly sanitize incoming HTML messages and instead passes them through a flawed XSS filter," he explains.
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"Cisco Jabber is vulnerable to Cross Site Scripting (XSS) through XHTML-IM messages. The one critical Jabber flaw allows an attacker to create a worm that spreads malware automatically between Jabber users without requiring user interaction, according to Thoresen. CEF allows developers to embed a natively sandboxed Chromium-based web browser in their applications. He's published a detailed account of the four flaws and the design of Jabber, which is based on the Chromium Embedded Framework (CEF). The flaw, tracked as CVE-2020-3495, has a severity rating of 9.9 out of 10 and should be patched immediately, given a report by Norwegian pen-tester Olav Sortland Thoresen of Watchcom, who discovered the flaws.
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The bug only affects vulnerable versions of the Cisco Jabber client for Windows that have XMPP messaging services enabled.
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"A successful exploit could allow the attacker to cause the application to execute arbitrary programs on the targeted system with the privileges of the user account that is running the Cisco Jabber client software, possibly resulting in arbitrary code execution," Cisco notes. SEE: Security Awareness and Training policy (TechRepublic Premium)
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Such an attack also poses a threat to the Windows system the Jabber client is running on.
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