Cisco Reissues Patches for Critical Bugs in Jabber Video Conferencing Software

  • Cisco has at the time all over again fixed four earlier disclosed critical bugs in its Jabber movie conferencing and messaging application that had been inadequately dealt with, leaving its buyers prone to remote assaults.

    The vulnerabilities, if successfully exploited, could enable an authenticated, distant attacker to execute arbitrary code on focus on devices by sending specifically-crafted chat messages in team discussions or specific people.

    They were being reported to the networking gear maker on September 25 by Watchcom, 3 months following the Norwegian cybersecurity agency publicly disclosed multiple security shortcomings in Jabber that were being discovered in the course of a penetration examination for a customer in June.

    The new flaws, which ended up uncovered following a person of its clientele asked for a verification audit of the patch, has an effect on all currently supported variations of the Cisco Jabber client (12.1 – 12.9).

    “A few of the 4 vulnerabilities Watchcom disclosed in September have not been adequately mitigated,” Watchcom claimed in a report printed nowadays. “Cisco unveiled a patch that mounted the injection points we described, but the underlying problem has not been fastened. As these types of, we were being able to 7ind new injection factors that could be utilised to exploit the vulnerabilities.”

    Most critical among the flaws is CVE-2020-26085 (very similar to CVE-2020-3495), which has a severity rating of 9.9 out of 10, a zero-click cross-site scripting (XSS) vulnerability that can be utilized to reach distant code execution by escaping the CEF sandbox.

    CEF or Chromium Embedded Framework is an open up-source framework which is used to embed a Chromium-primarily based web browser in other applications.

    Even though the embedded browser is sandboxed to stop unauthorized accessibility to documents, the scientists uncovered a way to bypass the protections by abusing the window.CallCppFunction, which is intended to open up documents sent by other Cisco Jabber consumers.

    All an adversary has to do is initiate a file transfer containing a malicious “.exe” file and drive the victim to acknowledge it working with an XSS attack, then induce a call to the aforementioned operate, leading to the executable to be run on the victim’s device.

    Worse, this vulnerability does not require person conversation and is wormable, indicating it can be utilized to instantly spread the malware to other units by disguising the payload in a chat information.

    A second flaw, CVE-2020-27132, stems from the way it parses HTML tags in XMPP messages, an XML-based mostly communications protocol utilized for facilitating prompt messaging amongst any two or far more network entities.

    Thanks to the deficiency of proper sanitization of these tags, a harmless file transfer message can be manipulated by injecting, say, an graphic HTML tag pointing to a malicious URL or even execute malicious JavaScript code.

    “No supplemental security measures had been place in position and it was as a result doable to both gain remote code execution and steal NTLM password hashes utilizing this new injection position,” the researchers mentioned.

    The third and closing vulnerability (CVE-2020-27127) is a command injection flaw relating to protocol handlers, which are used to notify the running system to open up precise URLs (e.g., XMPP://, IM://, and TEL://) in Jabber, building it feasible for an attacker to insert arbitrary command-line flags by merely including a area the URL.

    Presented the self-replicating mother nature of the attacks, it really is encouraged that Jabber buyers update to the newest version of the application to mitigate the risk.

    Watchcom also endorses that businesses think about disabling interaction with external entities as a result of Cisco Jabber until eventually all personnel have mounted the update.

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