Vulnerability CVE-2019-8955

Vulnerability Name:

CVE-2019-8955 (CCN-157892)

Assigned:

2019-02-21

Published:

2019-02-21

Updated:

2020-08-24

Summary:

In Tor before 0.3.3.12, 0.3.4.x before 0.3.4.11, 0.3.5.x before 0.3.5.8, and 0.4.x before 0.4.0.2-alpha, remote denial of service against Tor clients and relays can occur via memory exhaustion in the KIST cell scheduler.

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-770

Vulnerability Consequences:

Denial of Service

References:

Source: MITRE
Type: CNA
CVE-2019-8955

Source: SUSE
Type: UNKNOWN
openSUSE-SU-2019:1107

Source: BID
Type: Third Party Advisory, VDB Entry
107136

Source: CCN
Type: Tor Blog, February 21, 2019
New Releases: Tor 0.4.0.2-alpha, 0.3.5.8, 0.3.4.11, and 0.3.3.12

Source: MISC
Type: Vendor Advisory
https://blog.torproject.org/new-releases-tor-0402-alpha-0358-03411-and-03312

Source: XF
Type: UNKNOWN
tor-cve20198955-dos(157892)

Source: MISC
Type: Vendor Advisory
https://trac.torproject.org/projects/tor/ticket/29168

Vulnerable Configuration:

Configuration 1:

cpe:/a:torproject:tor:*:*:*:*:*:*:*:* (Version < 0.3.3.12)

OR cpe:/a:torproject:tor:0.3.4.0:alpha-dev:*:*:*:*:*:*

OR cpe:/a:torproject:tor:0.3.4.1:alpha:*:*:*:*:*:*

OR cpe:/a:torproject:tor:0.3.4.2:alpha:*:*:*:*:*:*

OR cpe:/a:torproject:tor:0.3.4.3:alpha:*:*:*:*:*:*

OR cpe:/a:torproject:tor:0.3.4.4:rc:*:*:*:*:*:*

OR cpe:/a:torproject:tor:0.3.4.5:rc:*:*:*:*:*:*

OR cpe:/a:torproject:tor:0.3.4.6:rc:*:*:*:*:*:*

OR cpe:/a:torproject:tor:0.3.4.7:rc:*:*:*:*:*:*

OR cpe:/a:torproject:tor:*:*:*:*:*:*:*:* (Version >= 0.3.4.8 and < 0.3.4.11)

OR cpe:/a:torproject:tor:0.3.5.0:alpha-dev:*:*:*:*:*:*

OR cpe:/a:torproject:tor:0.3.5.1:alpha:*:*:*:*:*:*

OR cpe:/a:torproject:tor:0.3.5.2:alpha:*:*:*:*:*:*

OR cpe:/a:torproject:tor:0.3.5.3:alpha:*:*:*:*:*:*

OR cpe:/a:torproject:tor:0.3.5.4:alpha:*:*:*:*:*:*

OR cpe:/a:torproject:tor:0.3.5.5:alpha:*:*:*:*:*:*

OR cpe:/a:torproject:tor:0.3.5.6:rc:*:*:*:*:*:*

OR cpe:/a:torproject:tor:0.3.5.7:*:*:*:*:*:*:*

OR cpe:/a:torproject:tor:0.4.0.1:alpha:*:*:*:*:*:*

Denotes that component is vulnerable

Oval Definitions

Definition ID	Class	Title	Last Modified
oval:org.opensuse.security:def:20198955	V	CVE-2019-8955	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:26396	P	Security update for chromium (Important)	2020-12-01
oval:org.opensuse.security:def:25325	P	Security update for freetype2 (Important)	2020-12-01
oval:org.opensuse.security:def:25700	P	Security update for java-1_7_1-ibm (Important)	2020-12-01
oval:org.opensuse.security:def:25060	P	Security update for libssh2_org (Moderate)	2020-12-01
oval:org.opensuse.security:def:26431	P	Security update for tor (Moderate)	2020-12-01
oval:org.opensuse.security:def:25409	P	Security update for apache-commons-httpclient (Important)	2020-12-01
oval:org.opensuse.security:def:25714	P	Security update for libpng16 (Moderate)	2020-12-01
oval:org.opensuse.security:def:25187	P	Security update for java-1_7_0-openjdk (Important)	2020-12-01
oval:org.opensuse.security:def:25559	P	Security update for mozilla-nspr, mozilla-nss (Important)	2020-12-01
oval:org.opensuse.security:def:24985	P	Security update for libsolv, libzypp, zypper (Moderate)	2020-12-01
oval:org.opensuse.security:def:25758	P	Security update for flash-player (Important)	2020-12-01
oval:org.opensuse.security:def:25268	P	Security update for mozilla-nspr, mozilla-nss (Moderate)	2020-12-01
oval:org.opensuse.security:def:25612	P	Security update for shim (Moderate)	2020-12-01
oval:org.opensuse.security:def:24996	P	Security update for the Linux Kernel (Important)	2020-12-01
oval:com.ubuntu.xenial:def:201989550000000	V	CVE-2019-8955 on Ubuntu 16.04 LTS (xenial) - medium.	2019-02-21
oval:com.ubuntu.bionic:def:20198955000	V	CVE-2019-8955 on Ubuntu 18.04 LTS (bionic) - medium.	2019-02-21
oval:com.ubuntu.disco:def:201989550000000	V	CVE-2019-8955 on Ubuntu 19.04 (disco) - medium.	2019-02-21
oval:com.ubuntu.cosmic:def:20198955000	V	CVE-2019-8955 on Ubuntu 18.10 (cosmic) - medium.	2019-02-21
oval:com.ubuntu.cosmic:def:201989550000000	V	CVE-2019-8955 on Ubuntu 18.10 (cosmic) - medium.	2019-02-21
oval:com.ubuntu.trusty:def:20198955000	V	CVE-2019-8955 on Ubuntu 14.04 LTS (trusty) - medium.	2019-02-21
oval:com.ubuntu.bionic:def:201989550000000	V	CVE-2019-8955 on Ubuntu 18.04 LTS (bionic) - medium.	2019-02-21
oval:com.ubuntu.xenial:def:20198955000	V	CVE-2019-8955 on Ubuntu 16.04 LTS (xenial) - medium.	2019-02-21

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