Information disclosure in Linux kernel - CVE-2017-17449

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Main Vulnerability Database Vulnerabilities #VU9769

Information disclosure in Linux kernel - CVE-2017-17449

Published: December 26, 2017


Vulnerability identifier: #VU9769
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-2017-17449
CWE-ID: CWE-200
Exploitation vector: Local access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a local attacker to obtain potentially sensitive information on the target system.

The weakness exists due to the __netlink_deliver_tap_skb function in net/netlink/af_netlink.c in the Linux kernel, when CONFIG_NLMON is enabled, does not restrict observations of Netlink messages to a single net namespace. A local attacker can leverage the CAP_NET_ADMIN capability to sniff an nlmon interface for all Netlink activity on the system and read arbitrary files.

Affected software

Linux kernel
Debian Linux
Arch Linux
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for Real Time
Red Hat Enterprise Linux for Real Time for NFV
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for Scientific Computing
Red Hat Enterprise Linux for Power, big endian
Red Hat Enterprise Linux Desktop
Red Hat Enterprise Linux Workstation
Red Hat Enterprise Linux for IBM System z (Structure A)
Red Hat Enterprise Linux Server
Red Hat Enterprise Linux for Power 9
Red Hat Enterprise Linux for ARM 64
Red Hat Enterprise Linux Server - AUS
Red Hat Enterprise Linux Server - Extended Update Support
Red Hat Enterprise Linux for Power, big endian - Extended Update Support
Red Hat Enterprise Linux Server - TUS
Red Hat Enterprise Linux for Power, little endian - Extended Update Support
Red Hat Enterprise Linux for IBM z Systems - Extended Update Support
Red Hat Enterprise Linux EUS Compute Node
SUSE Linux
Fedora

FlashSystem 900 9840-AE3 and 9843-AE3
FlashSystem 900 9840-AE2 and 9843-AE2
SAN Volume Controller and Storwize Family
FlashSystem 900 9843-UF3
FlashSystem 840 9840-AE1 & 9843-AE1
MRG Realtime
kernel (Red Hat package)
kernel-rt (Red Hat package)
kernel-alt (Red Hat package)
Red Hat Enterprise Linux Server for x86_64 - Update Services for SAP Solutions
Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions
kernel
Red Hat Virtualization Host

How to mitigate CVE-2017-17449

Update to version 4.14.4.

kernel (Red Hat package) - addressed in versions 3.10.0-693.25.2.el7, 3.10.0-862.el7
kernel-rt (Red Hat package) - addressed in versions 3.10.0-693.25.2.rt56.612.el6rt, 3.10.0-862.rt56.804.el7
kernel-alt (Red Hat package) - update to 4.14.0-49.el7a
kernel - addressed in versions 4.14.6-200.fc26, 4.14.6-300.fc27
SAN Volume Controller and Storwize Family - addressed in versions 7.8.1.8, 8.1.3.3, 8.2.0.0, 8.2.1.0

External References

Related Security Bulletins