Permissions, Privileges, and Access Controls in Linux kernel - CVE-2019-17056

Vulnerability identifier: #VU22747

CSH Severity: Low

CVSS v4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]

CVE-ID: CVE-2019-17056

CWE-ID: CWE-264

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to the llcp_sock_create() function in net/nfc/llcp_sock.c in the AF_NFC network module for the Linux kernel does not enforce CAP_NET_RAW. A local unprivileged user can create a raw socket.

Linux kernel
Slackware Linux
Fedora
linux-4.4.199/kernel-generic
linux-4.4.199/kernel-huge
linux-4.4.199/kernel-modules
linux-4.4.199/kernel-headers
kernel
kernel-headers
kernel-tools

Install update from vendor's website.

Linux kernel - update to 5.3.3
linux-4.4.199/kernel-generic - update to 4.4.199
linux-4.4.199/kernel-huge - update to 4.4.199
linux-4.4.199/kernel-modules - update to 4.4.199
linux-4.4.199/kernel-headers - update to 4.4.199_smp
kernel - addressed in versions 5.2.20-100.fc29, 5.3.4-300.fc31, 5.3.6-100.fc29
kernel-headers - addressed in versions 5.2.20-100.fc29, 5.3.4-300.fc31, 5.3.6-100.fc29
kernel-tools - addressed in versions 5.2.20-100.fc29, 5.3.4-300.fc31, 5.3.6-100.fc29

• http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00064.html
• https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=0edc3f703f7bcaf550774b5d43ab727bcd0fe06b
• https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=3a359798b176183ef09efb7a3dc59abad1cc7104

• Permissions, Privileges, and Access Controls in Linux kernel
• Slackware Linux update for kernel
• Fedora 31 update for kernel, kernel-headers, kernel-tools
• Fedora 29 update for kernel, kernel-headers, kernel-tools
• Fedora 29 update for kernel, kernel-headers, kernel-tools