Debian DSA-4774-1 : linux - security update

high Nessus Plugin ID 141552
New! Plugin Severity Now Using CVSS v3

The calculated severity for Plugins has been updated to use CVSS v3 by default. Plugins that do not have a CVSS v3 score will fall back to CVSS v2 for calculating severity. Severity display preferences can be toggled in the settings dropdown.


The remote Debian host is missing a security-related update.


Several vulnerabilities have been discovered in the Linux kernel that may lead to the execution of arbitrary code, privilege escalation, denial of service or information leaks.

- CVE-2020-12351 Andy Nguyen discovered a flaw in the Bluetooth implementation in the way L2CAP packets with A2MP CID are handled. A remote attacker in short distance knowing the victim's Bluetooth device address can send a malicious l2cap packet and cause a denial of service or possibly arbitrary code execution with kernel privileges.

- CVE-2020-12352 Andy Nguyen discovered a flaw in the Bluetooth implementation. Stack memory is not properly initialised when handling certain AMP packets. A remote attacker in short distance knowing the victim's Bluetooth device address can retrieve kernel stack information.

- CVE-2020-25211 A flaw was discovered in netfilter subsystem. A local attacker able to inject conntrack Netlink configuration can cause a denial of service.

- CVE-2020-25643 ChenNan Of Chaitin Security Research Lab discovered a flaw in the hdlc_ppp module. Improper input validation in the ppp_cp_parse_cr() function may lead to memory corruption and information disclosure.

- CVE-2020-25645 A flaw was discovered in the interface driver for GENEVE encapsulated traffic when combined with IPsec. If IPsec is configured to encrypt traffic for the specific UDP port used by the GENEVE tunnel, tunneled data isn't correctly routed over the encrypted link and sent unencrypted instead.


Upgrade the linux packages.

For the stable distribution (buster), these problems have been fixed in version 4.19.152-1. The vulnerabilities are fixed by rebasing to the new stable upstream version 4.19.152 which includes additional bugfixes.

See Also

Plugin Details

Severity: High

ID: 141552

File Name: debian_DSA-4774.nasl

Version: 1.3

Type: local

Agent: unix

Published: 10/20/2020

Updated: 4/12/2021

Dependencies: ssh_get_info.nasl

Risk Information

CVSS Score Source: CVE-2020-25643


Risk Factor: Critical

Score: 9


Risk Factor: High

Base Score: 7.5

Temporal Score: 5.9

Vector: AV:N/AC:M/Au:S/C:P/I:P/A:C

Temporal Vector: E:POC/RL:OF/RC:C


Risk Factor: High

Base Score: 7.2

Temporal Score: 6.5

Vector: CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

Temporal Vector: E:P/RL:O/RC:C

Vulnerability Information

CPE: p-cpe:/a:debian:debian_linux:linux, cpe:/o:debian:debian_linux:10.0

Required KB Items: Host/local_checks_enabled, Host/Debian/release, Host/Debian/dpkg-l

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 10/19/2020

Vulnerability Publication Date: 9/9/2020

Reference Information

CVE: CVE-2020-12351, CVE-2020-12352, CVE-2020-25211, CVE-2020-25643, CVE-2020-25645

DSA: 4774