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CVE-2017-9248: Progress Telerik UI for ASP.NET AJAX and Sitefinity Cryptographic Weakness Vulnerability

criticalknown exploitedpublic exploitCVE-2017-9248
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.
Progress Telerik UI for ASP.NET AJAX and Sitefinity have a cryptographic weakness in Telerik.Web.UI.dll that can be exploited to disclose encryption keys (Telerik.Web.UI.DialogParametersEncryptionKey and/or the MachineKey), perform cross-site-scripting (XSS) attacks, compromise the ASP.NET ViewState, and/or upload and download files.

CSIRTS triage

vendor: Progressproduct: Telerik UI for ASP.NET AJAX and SitefinityInformation disclosureCross-site scriptingOther
What
There is a cryptographic weakness that can be exploited to disclose encryption keys and perform XSS attacks.
Who is affected
Deployments of Progress Telerik UI for ASP.NET AJAX and Sitefinity.
Urgency
Remediation is critical due to active exploitation and the severity of the vulnerabilities.
Action
Apply the latest security updates for Telerik UI and Sitefinity.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source
CISA Known Exploited Vulnerabilities (US · database · site)
Severity
critical
Published
2021-11-03
Exploitation
Observed in the wild (CISA KEV)

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2017-9248

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2017-9248coverage & exploitation statusNVD · CVE.org

Recent advisories for Progress Telerik UI

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

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