External risk intelligence

Telerik UI for ASP.NET AJAX and Sitefinity Cryptographic Weakness

CVE advisoryKnown Exploit

CVE-2017-9248

A vulnerability in Progress Telerik UI for ASP.NET AJAX and Sitefinity allows remote attackers to bypass security, potentially leading to unauthorized access and data compromise. The flaw involves the weak protection of encryption keys, enabling attackers to leak them and facilitate further malicious activities like ar

4Halo Surface Signal

Cross-site Scripting

Progress Sitefinity

before 10.0.6412.02017.2.503 and earlier

External exposure likelihood

Halo Surface Signal score for CVE-2017-9248

The affected products, Telerik UI for ASP.NET AJAX and Progress Sitefinity, are commonly used as the foundation for internet-facing web applications, portals, and public-facing content management systems. These frameworks are designed to be deployed as public web services, making the vulnerability directly reachable via standard web traffic.

Horizon Alert

Summary of the vulnerability and why it matters

A vulnerability exists within Progress Telerik UI for ASP.NET AJAX and Sitefinity products. This flaw allows attackers to bypass security protections, potentially leading to unauthorized access and manipulation of sensitive data. The primary concern is the exposure of cryptographic keys, which can enable further malicious activities.

  • Vulnerable Telerik UI components
  • Weak protection of encryption keys
  • Compromised data and system access

Attack Path

How an attacker could exploit the issue

The vulnerability allows remote attackers to compromise systems by exploiting cryptographic weaknesses in Telerik UI for ASP.NET AJAX and Progress Sitefinity. Attackers can bypass security measures to gain unauthorized access, upload or download files, and execute cross-site scripting attacks. This impact stems from the improper protection of encryption keys, which can be leaked, leading to broader system compromise.

  • Network exposure required.
  • Attacker triggers file upload.
  • Results in arbitrary file access.

Live Threat

Current exploitation, exposure, and threat context

This vulnerability presents a significant risk due to its potential for widespread compromise of sensitive data and application integrity. Attackers can exploit this weakness remotely, leading to unauthorized access and manipulation of the affected systems. The potential consequences include data breaches, malicious code injection, and the complete takeover of user sessions. Organizations utilizing the affected Progress Telerik UI for ASP.NET AJAX or Sitefinity versions should consider immediate remediation to mitigate these severe business risks.

  • Likely attacker skill level: Low
  • Required access or conditions: Network access
  • Business risk or urgency: High

Priority actions

Operational Fix

Recommended remediation, mitigation, and detection steps

This vulnerability in Progress Telerik UI for ASP.NET AJAX and Sitefinity could allow attackers to compromise sensitive data, upload or download files, or execute arbitrary code. The issue stems from improper protection of encryption keys, which can be leaked to enable these attacks. The high severity and direct network exploitability indicate a significant business risk for organizations utilizing these affected products.

  • Identify assets using Telerik UI or Sitefinity.
  • Isolate exposed systems from external access.
  • Apply vendor updates and validate the fix.
  • Monitor for related malicious activity.

Frequently asked questions

What is Telerik UI for ASP.NET AJAX and Sitefinity?

Telerik UI for ASP.NET AJAX and Progress Sitefinity are software products used for building web applications and content management systems. They provide tools and components that help developers create interactive and feature-rich websites.

What weakness class does CVE-2017-9248 fall into?

CVE-2017-9248 is categorized as CWE-522, which involves the improper exposure of sensitive information. In this case, it means that encryption keys used by the software are not adequately protected, making them easier for attackers to discover.

How can an attacker exploit this vulnerability?

An attacker can exploit this vulnerability without any special preconditions or access; they only need network access to the vulnerable application. The bug is triggered by the way the software handles its encryption keys, specifically Telerik.Web.UI.DialogParametersEncryptionKey or the MachineKey, which are not properly secured.

Who should care about CVE-2017-9248, based on its exposure?

Organizations running internet-facing web applications, portals, or public-facing content management systems built with these affected Progress Telerik products should be concerned. The vulnerability is classified as external, meaning it can be reached through standard web traffic, posing a direct risk to publicly accessible systems.

What are the first steps for someone running this technology?

First, identify all assets using Telerik UI for ASP.NET AJAX or Progress Sitefinity. Then, if possible, isolate any systems with these products that are exposed to external access. The most crucial step is to apply vendor-provided updates to remediate the vulnerability and then validate that the fix has been successfully implemented.

References