#VU51269 Information disclosure


Published: 2021-03-09

Vulnerability identifier: #VU51269

Vulnerability risk: Medium

CVSSv3.1:

CVE-ID: CVE-2019-18282

CWE-ID: CWE-200

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Linux kernel
Operating systems & Components / Operating system

Vendor:

Description

The vulnerability allows a remote attacker to track devices via UDP packets.

The vulnerability exists due to excessive data output in the flow_dissector feature in the Linux kernel 4.3 through 5.x before 5.3.10 and affects net/core/flow_dissector.c and related code. The auto flowlabel of a UDP IPv6 packet relies on a 32-bit hashrnd value as a secret, and because jhash (instead of siphash) is used. The hashrnd value remains the same starting from boot time, and can be inferred by an attacker. A remote attacker can use the hashrnd value and track reliably track activity of devices using UDP packets.

Mitigation
Install updates from vendor's website.

Vulnerable software versions


External links
http://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.3.10
http://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=55667441c84fa5e0911a0aac44fb059c15ba6da2
http://lists.debian.org/debian-lts-announce/2020/03/msg00001.html
http://security.netapp.com/advisory/ntap-20200204-0002/
http://www.computer.org/csdl/proceedings-article/sp/2020/349700b594/1j2LgrHDR2o


Q & A

Can this vulnerability be exploited remotely?

Is there known malware, which exploits this vulnerability?


Latest bulletins with this vulnerability