Advisory Details

May 25th, 2021

(Pwn2Own) Canonical Ubuntu eBPF Out-Of-Bounds Access Privilege Escalation Vulnerability

CVE ID	CVE-2021-3490
CVSS SCORE	8.8, AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
AFFECTED VENDORS	Canonical
AFFECTED PRODUCTS	Ubuntu
VULNERABILITY DETAILS	This vulnerability allows local attackers to escalate privileges on affected installations of Canonical Ubuntu. 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 eBPF programs. The issue results from the lack of proper validation of user-supplied eBPF programs prior to executing them. An attacker can leverage this vulnerability to escalate privileges and execute code in the context of the kernel.
ADDITIONAL DETAILS	Canonical has issued an update to correct this vulnerability. More details can be found at: https://www.openwall.com/lists/oss-security/2021/05/11/11
DISCLOSURE TIMELINE	2021-05-14 - Vulnerability reported to vendor 2021-05-25 - Coordinated public release of advisory
CREDIT	Manfred Paul (@_manfp) of the RedRocket CTF team (@redrocket_ctf)

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