CVE-2023-39193: Linux Kernel Netfilter Xtables Out-Of-Bounds Read Information Disclosure Vulnerability

An out-of-bounds read issue was found in the Linux kernel in the matchflags() function, which belongs to the Xtables SCTP protocol packet matching. This flaw requires CAPNETADMIN to be exploited and could lead to information disclosure.

— Red Hat

Linux Kernel could allow a local authenticated attacker to obtain sensitive information, caused by an out-of-bounds read flaw in the matchflags function in Netfilter Xtables. By sending a specially crafted request, an attacker could exploit this vulnerability to obtain sensitive information, and use this information to launch further attacks against the affected system.

— IBM

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 matchflags 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.

— ZDI