A vulnerability, which was classified as problematic, was found in TrueConf Server 4.3.7. This affects some unknown processing. The manipulation with an unknown input leads to a cross site scripting vulnerability (Stored). CWE is classifying the issue as CWE-80. The software receives input from an upstream component, but it does not neutralize or incorrectly neutralizes special characters such as "<", ">", and "&" that could be interpreted as web-scripting elements when they are sent to a downstream component that processes web pages. This is going to have an impact on integrity. An attacker might be able to inject arbitrary html and script code into the web site. This would alter the appearance and would make it possible to initiate further attacks against site visitors.

The weakness was disclosed 01/29/2017 by LiquidWorm as EDB-ID 41184 as not defined exploit (Exploit-DB). It is possible to read the advisory at exploit-db.com. This vulnerability is uniquely identified as CVE-2017-20113. It is possible to initiate the attack remotely. It demands that the victim is doing some kind of user interaction. Technical details are unknown but a public exploit is available. The attack technique deployed by this issue is T1059.007 according to MITRE ATT&CK.

A public exploit has been developed by LiquidWorm and been published immediately after the advisory. It is declared as proof-of-concept. The exploit is shared for download at exploit-db.com.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at Exploit-DB (41184). The entries 96628, 96629, 96630 and 96631 are pretty similar.

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• TrueConf

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• Server

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