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In the wild, CERT Coordination Center (CERT/CC) in Carnegie Mellon University alerts about a Checkbox Survey vulnerability that might enable a remote attacker to unleash arbitrary code without actual identification.
A checkbox is a GUI widget that allows the user to choose between one of the two mutually exclusive alternatives. The Checkbox Survey allows organizations generate professional surveys with quick access from any desktop or mobile device, as a customizable online surveillance tool designed in ASP.NET. For example, a basic yes/no inquiry may ask the user to answer in ‘yes’ or ‘no.’ Checkboxes will be displayed with the required choices.
This vulnerability in the Checkbox Survey, which was identified as CVE-2021-27852, is linked to the insecure deserialization of view state data, a technique applied by the ASP.NET web page framework.
Microsoft stated that “When the HTML markup for the page is rendered, the current state of the page and values that must be retained during postback are serialized into base64-encoded strings. This information is then put into the view state hidden field or fields.”
By using a _VSTATE arguments, before version 7.0 – the Checkbox survey engaged its View State functionality that is deserialized using Los Formatter.
“Checkbox Survey before version 7.0 insecurely deserializes ASP.NET View State data, which can allow a remote, unauthenticated attacker to execute arbitrary code on a vulnerable server, “ read the advisory.
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Read the original article: An Advisory Issued by Carnegie Mellon University Warns Against the Vulnerability in Checkbox Survey