Debian DLA-187-1 : tor security update

Medium Nessus Plugin ID 82594

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VPR Score: 3.6


The remote Debian host is missing a security update.


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.

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.


Upgrade the affected tor, tor-dbg, and tor-geoipdb packages.

See Also

Plugin Details

Severity: Medium

ID: 82594

File Name: debian_DLA-187.nasl

Version: 1.6

Type: local

Agent: unix

Published: 2015/04/07

Updated: 2021/01/11

Dependencies: 12634

Risk Information

Risk Factor: Medium

VPR Score: 3.6

CVSS v2.0

Base Score: 5

Temporal Score: 4.3

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

Temporal Vector: CVSS2#E:ND/RL:OF/RC:C

CVSS v3.0

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

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

Exploit Available: false

Exploit Ease: No known exploits are available

Patch Publication Date: 2015/04/06

Vulnerability Publication Date: 2020/01/24

Reference Information

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

BID: 73932, 73938