Known exploited vulnerability
CVE-2019-18935
The short answer
CVE-2019-18935 affects n/a n/a and is rated critical (CVSS 9.8). CISA added it to the Known Exploited Vulnerabilities catalog on 2021-11-03: attackers are using it, so patch it first. The vendor has linked a patch.
What it is
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.)
Weakness: CWE-502.
Severity
9.8 critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Exploited (CISA KEV)
Yes, since Nov 3, 2021
Federal due date May 3, 2022
EPSS, next 30 days
100%
Higher than 100% of scored CVEs
How it can be exploited
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- High
- Integrity impact
- High
- Availability impact
- High
What CISA says to do
Apply updates per vendor instructions.
Affected products
n/a. NVD's record lists the exact affected versions.
References
- codewhitesec.blogspot.com/2019/02/telerik-revisited.html Not Applicable
- github.com/bao7uo/RAU_crypto ExploitThird Party Advisory
- github.com/noperator/CVE-2019-18935 ExploitThird Party Advisory
- know.bishopfox.com/research/cve-2019-18935-remote-code-execution-in-telerik-ui ExploitThird Party Advisory
- www.bleepingcomputer.com/news/security/us-federal-agency-hacked-using-old-telerik-bug-to-steal-data/ Press/Media Coverage
- www.telerik.com/support/kb/aspnet-ajax/details/allows-javascriptserializer-deserialization PatchVendor Advisory
- www.telerik.com/support/whats-new/aspnet-ajax/release-history/ui-for-asp-net-ajax-r1-2020-%28version-2020-1-114%29 Release Notes
- www.telerik.com/support/whats-new/release-history Release NotesVendor Advisory
- codewhitesec.blogspot.com/2019/02/telerik-revisited.html Not Applicable
- github.com/bao7uo/RAU_crypto ExploitThird Party Advisory
- github.com/noperator/CVE-2019-18935 ExploitThird Party Advisory
- know.bishopfox.com/research/cve-2019-18935-remote-code-execution-in-telerik-ui ExploitThird Party Advisory
Questions
Is CVE-2019-18935 being exploited?
Yes. CISA added CVE-2019-18935 to its Known Exploited Vulnerabilities catalog on 2021-11-03, with a federal remediation due date of 2022-05-03. CISA lists it as used in ransomware campaigns.
How do I fix CVE-2019-18935?
CISA's required action: Apply updates per vendor instructions.
From NVD, CISA KEV, FIRST EPSS and OSV.dev, checked . Status on NVD: Analyzed. The description is NVD's text, quoted as published.
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