Debian DLA-2442-1 : obfs4proxy security update

medium Nessus Plugin ID 142667
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.

Synopsis

The remote Debian host is missing a security update.

Description

golang-go.crypto was recently updated with a fix for CVE-2019-11840.
This in turn requires all packages that use the affected code to be recompiled in order to pick up the security fix.

CVE-2019-11840

An issue was discovered in supplementary Go cryptography libraries, aka golang-googlecode-go-crypto. If more than 256 GiB of keystream is generated, or if the counter otherwise grows greater than 32 bits, the amd64 implementation will first generate incorrect output, and then cycle back to previously generated keystream. Repeated keystream bytes can lead to loss of confidentiality in encryption applications, or to predictability in CSPRNG applications.

For Debian 9 stretch, this problem has been fixed in version3 0.0.7-1+deb8u1.

We recommend that you upgrade your obfs4proxy packages.

For the detailed security status of obfs4proxy please refer to its security tracker page at:
https://security-tracker.debian.org/tracker/obfs4proxy

NOTE: Tenable Network Security has extracted the preceding description block directly from the DLA security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

Solution

Upgrade the affected obfs4proxy package.

See Also

https://lists.debian.org/debian-lts-announce/2020/11/msg00016.html

https://packages.debian.org/source/stretch/obfs4proxy

https://security-tracker.debian.org/tracker/source-package/obfs4proxy

Plugin Details

Severity: Medium

ID: 142667

File Name: debian_DLA-2442.nasl

Version: 1.3

Type: local

Agent: unix

Published: 11/10/2020

Updated: 11/20/2020

Dependencies: ssh_get_info.nasl

Risk Information

CVSS Score Source: CVE-2019-11840

VPR

Risk Factor: Low

Score: 3.6

CVSS v2

Risk Factor: Medium

Base Score: 4.3

Temporal Score: 3.2

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

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

CVSS v3

Risk Factor: Medium

Base Score: 5.9

Temporal Score: 5.2

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

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

Vulnerability Information

CPE: p-cpe:/a:debian:debian_linux:obfs4proxy, cpe:/o:debian:debian_linux:9.0

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

Exploit Ease: No known exploits are available

Patch Publication Date: 11/9/2020

Vulnerability Publication Date: 5/9/2019

Reference Information

CVE: CVE-2019-11840