CVE-2020-0839 Windows dnsrslvr.dll Elevation of Privilege Vulnerability
A local attacker can execute code with elevated permissions by exploiting a memory handling flaw in the Windows DNS resolver library.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2020-0839?
CVE-2020-0839 is a high-severity memory corruption vulnerability in Microsoft Windows 10, published on 11 Sep 2020. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
<p>An elevation of privilege vulnerability exists in the way that the dnsrslvr.dll handles objects in memory. An attacker who successfully exploited the vulnerability could execute code with elevated permissions.</p> <p>To exploit the vulnerability, a locally authenticated attacker could run a specially crafted application.</p> <p>The security update addresses the vulnerability by ensuring the dnsrslvr.dll properly handles objects in memory.</p>
Which versions are affected by CVE-2020-0839?
It affects 3 products.
Products include Microsoft Windows 10, Microsoft Windows Server 2016, Microsoft Windows Server 2019.
How do I fix CVE-2020-0839?
No fix has been published for CVE-2020-0839 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2020-0839 being exploited?
There is no known exploitation of CVE-2020-0839 in the wild and no public exploit code.
Other vulnerabilities in Microsoft Windows 10
- CVE-2015-2426 Microsoft Windows Adobe Type Manager Library Remote Code Execution
- CVE-2015-1769 Microsoft Windows Mount Manager Privilege Escalation
- CVE-2020-1467 Windows Hard Link Elevation of Privilege Vulnerability
- CVE-2021-26424 Windows TCP/IP Remote Code Execution Vulnerability
- CVE-2021-28476 Windows Hyper-V Remote Code Execution Vulnerability
Sources
Also known as GHSA-p938-6r45-wv6w.