Advisory Details

September 29th, 2023

Linux Kernel Netfilter Xtables Out-Of-Bounds Read Information Disclosure Vulnerability

ZDI-23-1490
ZDI-CAN-18408

CVE ID CVE-2023-39192
CVSS SCORE 6.7, AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:L
AFFECTED VENDORS Linux
AFFECTED PRODUCTS Kernel
VULNERABILITY DETAILS

This vulnerability allows local attackers to disclose sensitive information on affected installations of the Linux Kernel. An attacker must first obtain the ability to execute high-privileged code on the target system in order to exploit this vulnerability.

The specific flaw exists within the u32_match_it function. The issue results from the lack of proper validation of user-supplied data, which can result in a read past the end of an allocated data structure. An attacker can leverage this in conjunction with other vulnerabilities to execute arbitrary code in the context of the kernel.

ADDITIONAL DETAILS Linux has issued an update to correct this vulnerability. More details can be found at:
https://lore.kernel.org/all/20230828132107.18376-1-wander@redhat.com/
DISCLOSURE TIMELINE
  • 2022-09-21 - Vulnerability reported to vendor
  • 2023-09-29 - Coordinated public release of advisory
CREDIT grigoritchy
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