Deserialization in Telerik Ui For Asp.net Ajax
CVE-2019-18935
Progress Telerik UI for ASP.NET AJAX through 2019.3.1023 contains a .NET deserialization vulnerability in the RadAsyncUpload function. This is exploitable when the encryption keys are known due to the presence of CVE-2017-11317 or CVE-2017-11357, or other means. Exploitation can result in remote code execution. (As of 2020.1.114, a default setting prevents the exploit. In 2019.3.1023, but not earlier versions, a non-default setting can prevent exploitation.)
Vulnerability class: Insecure Deserialization
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.997 (100.0th percentile), scored .
Very high probability of exploitation in the next 30 days — among the top 0.1% most-likely-to-be-exploited CVEs. 100th percentile — 100.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.997 · newest: 0.997 · change: 0.000
Affected products
Weakness classification (CWE)
CISA KEV (Known Exploited Vulnerabilities)
This CVE is on the CISA KEV catalog, added on . CISA KEV inclusion means CISA has confirmed in-the-wild exploitation; US federal agencies are required to remediate within a published due date.
BOD 22-01 due date: .
Required action: Apply updates per vendor instructions.
Known ransomware campaign use: yes.
Public proof-of-concept exploits
References
- www.telerik.com/support/whats-new/release-history (Release Notes, Vendor Advisory)
- codewhitesec.blogspot.com/2019/02/telerik-revisited.html (Not Applicable)
- www.telerik.com/support/kb/aspnet-ajax/details/allows-javascriptserializer-dese… (Patch, Vendor Advisory)
- github.com/bao7uo/RAU_crypto (Exploit, Third Party Advisory)
- know.bishopfox.com/research/cve-2019-18935-remote-code-execution-in-telerik-ui (Exploit, Third Party Advisory)
- github.com/noperator/CVE-2019-18935 (Exploit, Third Party Advisory)
- packetstormsecurity.com/files/155720/Telerik-UI-Remote-Code-Execution.html (VDB Entry, Third Party Advisory)
- www.telerik.com/support/whats-new/aspnet-ajax/release-history/ui-for-asp-net-aj… (Release Notes)
- packetstormsecurity.com/files/159653/Telerik-UI-ASP.NET-AJAX-RadAsyncUpload-Des… (Exploit, VDB Entry, Third Party Advisory)
- www.bleepingcomputer.com/news/security/us-federal-agency-hacked-using-old-teler… (Press/Media Coverage)
Frequently asked questions
- What is CVE-2019-18935?
- CVE-2019-18935 is a critical-severity vulnerability in Telerik Ui For Asp.net Ajax, classified under Deserialization of Untrusted Data. CVSS score: 9.8/10. Published 2019-12-11.
- How severe is CVE-2019-18935?
- Critical severity. CVSS v3 base score is 9.8 out of 10.
- Is CVE-2019-18935 known to be exploited?
- Yes. CVE-2019-18935 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2021-11-03), indicating it is being actively exploited. 101 public proof-of-concept repositories are indexed.