Debian DSA-4961-1 : tor - security update

high Nessus Plugin ID 152753

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Synopsis

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

Description

The remote Debian 11 host has packages installed that are affected by a vulnerability as referenced in the dsa-4961 advisory.

Henry de Valence reported a flaw in the signature verification code in Tor, a connection-based low-latency anonymous communication system. A remote attacker can take advantage of this flaw to cause an assertion failure, resulting in denial of service. For the oldstable distribution (buster), this problem has been fixed in version 0.3.5.16-1. For the stable distribution (bullseye), this problem has been fixed in version 0.4.5.10-1~deb11u1. We recommend that you upgrade your tor packages. For the detailed security status of tor please refer to its security tracker page at: https://security- tracker.debian.org/tracker/tor

Tenable has extracted the preceding description block directly from the Debian security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

Upgrade the tor packages.

For the stable distribution (bullseye), this problem has been fixed in version 0.4.5.10-1~deb11u1.

Plugin Details

Severity: High

ID: 152753

File Name: debian_DSA-4961.nasl

Version: 1.5

Type: local

Agent: unix

Family: Debian Local Security Checks

Published: 8/23/2021

Updated: 1/24/2025

Supported Sensors: Agentless Assessment, Continuous Assessment, Frictionless Assessment Agent, Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.4

CVSS v2

Risk Factor: Medium

Base Score: 5

Temporal Score: 3.9

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P

CVSS Score Source: CVE-2021-38385

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.7

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

Temporal Vector: CVSS:3.0/E:P/RL:O/RC:C

Vulnerability Information

CPE: p-cpe:/a:debian:debian_linux:tor-geoipdb, p-cpe:/a:debian:debian_linux:tor, cpe:/o:debian:debian_linux:11.0

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: 8/23/2021

Vulnerability Publication Date: 8/23/2021

Reference Information

CVE: CVE-2021-38385

Detections

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