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Debian DLA-187-1 : tor security update

high Nessus Plugin ID 82594

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Synopsis

The remote Debian host is missing a security update.

Description

Several hidden service related denial of service issues have been discovered in Tor, a connection-based low-latency anonymous communication system.

o 'disgleirio' discovered that a malicious client could trigger an assertion failure in a Tor instance providing a hidden service, thus rendering the service inaccessible. [CVE-2015-2928]

o 'DonnchaC' discovered that Tor clients would crash with an assertion failure upon parsing specially crafted hidden service descriptors.
[CVE-2015-2929]

o Introduction points would accept multiple INTRODUCE1 cells on one circuit, making it inexpensive for an attacker to overload a hidden service with introductions. Introduction points no longer allow multiple such cells on the same circuit.

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 tor, tor-dbg, and tor-geoipdb packages.

See Also

https://lists.debian.org/debian-lts-announce/2015/04/msg00001.html

https://packages.debian.org/source/squeeze-lts/tor

Plugin Details

Severity: High

ID: 82594

File Name: debian_DLA-187.nasl

Version: 1.6

Type: local

Agent: unix

Published: 4/7/2015

Updated: 1/11/2021

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

Risk Information

VPR

Risk Factor: Low

Score: 3.6

CVSS v2

Risk Factor: Medium

Base Score: 5

Temporal Score: 4.4

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

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 7.2

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:X/RL:O/RC:C

Vulnerability Information

CPE: p-cpe:/a:debian:debian_linux:tor-geoipdb, p-cpe:/a:debian:debian_linux:tor, p-cpe:/a:debian:debian_linux:tor-dbg, cpe:/o:debian:debian_linux:6.0

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

Exploit Ease: No known exploits are available

Patch Publication Date: 4/6/2015

Vulnerability Publication Date: 1/24/2020

Reference Information

CVE: CVE-2015-2928, CVE-2015-2929

BID: 73932, 73938