ZDI-CAN-20717: (Pwn2Own) Linux Kernel nftables Use-After-Free Local Privilege Escalation Vulnerability
First published: Thu Jul 06 2023(Updated: )
This vulnerability allows local attackers to escalate privileges on affected installations of Linux Kernel. An attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability. The specific flaw exists within the handling of nft_chains. The issue results from the lack of validating the status of a chain while processing lookup on the chain. An attacker can leverage this vulnerability to escalate privileges and execute arbitrary code in the context of the kernel.
| Affected Software | Affected Version | How to fix |
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Reference Links
Frequently Asked Questions
What is ZDI-CAN-20717?
ZDI-CAN-20717 is a Linux Kernel vulnerability that allows local attackers to escalate privileges on affected installations of Linux Kernel.
How can this vulnerability be exploited?
To exploit this vulnerability, the attacker must first obtain the ability to execute low-privileged code on the target system.
How severe is ZDI-CAN-20717?
The severity of ZDI-CAN-20717 is high with a CVSS score of 7.8.
What is the affected software for ZDI-CAN-20717?
The affected software for ZDI-CAN-20717 is the Linux Kernel.
Are there any references for ZDI-CAN-20717?
Yes, you can find references for ZDI-CAN-20717 at the following links: [Link 1](http://www.zerodayinitiative.com/advisories/ZDI-23-899/), [Link 2](https://lore.kernel.org/netfilter-devel/20230705121627.GC19489@breakpoint.cc/T/), [Link 3](https://www.zerodayinitiative.com/advisories/ZDI-23-899/).
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