Vulnerability CVE-2021-34549

Vulnerability Name:

CVE-2021-34549 (CCN-204661)

Assigned:

2021-06-10

Published:

2021-06-10

Updated:

2022-07-12

Summary:

An issue was discovered in Tor before 0.4.6.5, aka TROVE-2021-005. Hashing is mishandled for certain retrieval of circuit data. Consequently. an attacker can trigger the use of an attacker-chosen circuit ID to cause algorithm inefficiency.

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

7.5 High (CCN 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 (CCN 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

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

7.8 High (CCN CVSS v2 Vector: AV:N/AC:L/Au:N/C:N/I:N/A:C)

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

Vulnerability Type:

CWE-400

Vulnerability Consequences:

Denial of Service

References:

Source: MITRE
Type: CNA
CVE-2021-34549

Source: CCN
Type: Tor Blog, June 10, 2021
Tor

Source: CONFIRM
Type: Release Notes, Vendor Advisory
https://blog.torproject.org/node/2041

Source: XF
Type: UNKNOWN
tor-cve202134549-dos(204661)

Source: MISC
Type: Broken Link
https://gitlab.torproject.org/tpo/core/tor/-/issues/40391

Source: GENTOO
Type: Third Party Advisory
GLSA-202107-25

Source: CCN
Type: WhiteSource Vulnerability Database
CVE-2021-34549

Vulnerable Configuration:

Configuration 1:

cpe:/a:torproject:tor:*:*:*:*:*:*:*:* (Version < 0.3.5.15)

OR cpe:/a:torproject:tor:*:*:*:*:*:*:*:* (Version >= 0.4.0.0 and < 0.4.4.9)

OR cpe:/a:torproject:tor:*:*:*:*:*:*:*:* (Version >= 0.4.5.0 and < 0.4.5.9)

OR cpe:/a:torproject:tor:*:*:*:*:*:*:*:* (Version >= 0.4.6.0 and < 0.4.6.5)

Denotes that component is vulnerable

Oval Definitions

Definition ID	Class	Title	Last Modified
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:111538	P	Security update for tor (Important)	2021-07-08
oval:org.opensuse.security:def:11240	P	Security update for tor (Important)	2021-07-08
oval:org.opensuse.security:def:96495	P	Security update for tor (Important)	2021-06-29
oval:org.opensuse.security:def:109842	P	Security update for tor (Important)	2021-06-29
oval:org.opensuse.security:def:103185	P	Security update for tor (Important)	2021-06-29
oval:org.opensuse.security:def:11232	P	Security update for tor (Important)	2021-06-29
oval:org.opensuse.security:def:111464	P	Security update for tor (Important)	2021-06-25

BACK