Vulnerability CVE-2018-0490

Vulnerability Name:

CVE-2018-0490 (CCN-139857)

Assigned:

2017-11-27

Published:

2018-03-03

Updated:

2019-04-30

Summary:

An issue was discovered in Tor before 0.2.9.15, 0.3.1.x before 0.3.1.10, and 0.3.2.x before 0.3.2.10. The directory-authority protocol-list subprotocol implementation allows remote attackers to cause a denial of service (NULL pointer dereference and directory-authority crash) via a misformatted relay descriptor that is mishandled during voting.

CVSS v3 Severity:

7.5 High (CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
6.5 Medium (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C)

Exploitability Metrics:	Attack Vector (AV): Network Attack Complexity (AC): Low Privileges Required (PR): None User Interaction (UI): None
Scope:	Scope (S): Unchanged
Impact Metrics:	Confidentiality (C): None Integrity (I): None Availibility (A): High

5.3 Medium (CCN CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L)
4.6 Medium (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C)

Exploitability Metrics:	Attack Vector (AV): Network Attack Complexity (AC): Low Privileges Required (PR): None User Interaction (UI): None
Scope:	Scope (S): Unchanged
Impact Metrics:	Confidentiality (C): None Integrity (I): None Availibility (A): Low

CVSS v2 Severity:

5.0 Medium (CVSS v2 Vector: AV:N/AC:L/Au:N/C:N/I:N/A:P)

Exploitability Metrics:	Access Vector (AV): Network Access Complexity (AC): Low Authentication (Au): None
Impact Metrics:	Confidentiality (C): None Integrity (I): None Availibility (A): Partial

5.0 Medium (CCN CVSS v2 Vector: AV:N/AC:L/Au:N/C:N/I:N/A:P)

Exploitability Metrics:	Access Vector (AV): Network Access Complexity (AC): Low Athentication (Au): None
Impact Metrics:	Confidentiality (C): None Integrity (I): None Availibility (A): Partial

Vulnerability Type:

CWE-476

Vulnerability Consequences:

Denial of Service

References:

Source: MITRE
Type: CNA
CVE-2018-0490

Source: CCN
Type: Tor Blog, March 03, 2018
New stable Tor releases, with security fixes and DoS prevention: 0.3.2.10, 0.3.1.10, 0.2.9.15

Source: CONFIRM
Type: Vendor Advisory
https://blog.torproject.org/new-stable-tor-releases-security-fixes-and-dos-prevention-03210-03110-02915

Source: XF
Type: UNKNOWN
tor-cve20180490-dos(139857)

Source: CONFIRM
Type: Vendor Advisory
https://trac.torproject.org/projects/tor/ticket/25074

Source: DEBIAN
Type: Third Party Advisory
DSA-4183

Vulnerable Configuration:

Configuration 1:

cpe:/a:torproject:tor:*:*:*:*:*:*:*:* (Version <= 0.2.9.14)

OR cpe:/a:torproject:tor:0.3.1.1:alpha:*:*:*:*:*:*

OR cpe:/a:torproject:tor:0.3.1.2:alpha:*:*:*:*:*:*

OR cpe:/a:torproject:tor:0.3.1.3:alpha:*:*:*:*:*:*

OR cpe:/a:torproject:tor:0.3.1.4:alpha:*:*:*:*:*:*

OR cpe:/a:torproject:tor:0.3.1.5:alpha:*:*:*:*:*:*

OR cpe:/a:torproject:tor:0.3.1.6:rc:*:*:*:*:*:*

OR cpe:/a:torproject:tor:*:*:*:*:*:*:*:* (Version >= 0.3.1.7 and <= 0.3.1.9)

OR cpe:/a:torproject:tor:0.3.2.1:alpha:*:*:*:*:*:*

OR cpe:/a:torproject:tor:0.3.2.2:alpha:*:*:*:*:*:*

OR cpe:/a:torproject:tor:0.3.2.3:alpha:*:*:*:*:*:*

OR cpe:/a:torproject:tor:0.3.2.4:alpha:*:*:*:*:*:*

OR cpe:/a:torproject:tor:0.3.2.5:alpha:*:*:*:*:*:*

OR cpe:/a:torproject:tor:0.3.2.6:alpha:*:*:*:*:*:*

OR cpe:/a:torproject:tor:0.3.2.7:rc:*:*:*:*:*:*

OR cpe:/a:torproject:tor:0.3.2.8:rc:*:*:*:*:*:*

OR cpe:/a:torproject:tor:0.3.2.9:*:*:*:*:*:*:*

Configuration 2:

cpe:/o:debian:debian_linux:9.0:*:*:*:*:*:*:*

Denotes that component is vulnerable

Oval Definitions

Definition ID	Class	Title	Last Modified
oval:org.opensuse.security:def:20180490	V	CVE-2018-0490	2022-06-30
oval:org.opensuse.security:def:113539	P	tor-0.4.6.7-2.2 on GA media (Moderate)	2022-01-17
oval:org.opensuse.security:def:106934	P	tor-0.4.6.7-2.2 on GA media (Moderate)	2021-10-01
oval:org.opensuse.security:def:26377	P	Security update for kauth, kdelibs4 (Important)	2020-12-01
oval:org.opensuse.security:def:25306	P	Security update for squid (Critical)	2020-12-01
oval:org.opensuse.security:def:25681	P	Security update for xen (Important)	2020-12-01
oval:org.opensuse.security:def:25041	P	Security update for libpcap (Important)	2020-12-01
oval:org.opensuse.security:def:26412	P	Security update for tor (Moderate)	2020-12-01
oval:org.opensuse.security:def:25390	P	Security update for python3 (Important)	2020-12-01
oval:org.opensuse.security:def:25695	P	Security update for gcc9 (Moderate)	2020-12-01
oval:org.opensuse.security:def:25168	P	Security update for libvirt (Important)	2020-12-01
oval:org.opensuse.security:def:25540	P	Security update for java-1_7_1-ibm (Important)	2020-12-01
oval:org.opensuse.security:def:24966	P	Security update for libu2f-host (Moderate)	2020-12-01
oval:org.opensuse.security:def:25739	P	Security update for MozillaFirefox (Important)	2020-12-01
oval:org.opensuse.security:def:25249	P	Security update for librsvg (Moderate)	2020-12-01
oval:org.opensuse.security:def:25593	P	Security update for openvpn (Moderate)	2020-12-01
oval:org.opensuse.security:def:24977	P	Security update for libxslt (Moderate)	2020-12-01
oval:com.ubuntu.bionic:def:201804900000000	V	CVE-2018-0490 on Ubuntu 18.04 LTS (bionic) - medium.	2018-03-05
oval:com.ubuntu.artful:def:20180490000	V	CVE-2018-0490 on Ubuntu 17.10 (artful) - medium.	2018-03-05
oval:com.ubuntu.xenial:def:20180490000	V	CVE-2018-0490 on Ubuntu 16.04 LTS (xenial) - medium.	2018-03-05
oval:com.ubuntu.xenial:def:201804900000000	V	CVE-2018-0490 on Ubuntu 16.04 LTS (xenial) - medium.	2018-03-05
oval:com.ubuntu.bionic:def:20180490000	V	CVE-2018-0490 on Ubuntu 18.04 LTS (bionic) - medium.	2018-03-05
oval:com.ubuntu.cosmic:def:20180490000	V	CVE-2018-0490 on Ubuntu 18.10 (cosmic) - medium.	2018-03-05
oval:com.ubuntu.cosmic:def:201804900000000	V	CVE-2018-0490 on Ubuntu 18.10 (cosmic) - medium.	2018-03-05
oval:com.ubuntu.trusty:def:20180490000	V	CVE-2018-0490 on Ubuntu 14.04 LTS (trusty) - medium.	2018-03-05

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