Vulnerability Name:

CVE-2021-34550 (CCN-203759)

Assigned:2021-06-14
Published:2021-06-14
Updated:2021-09-20
Summary:An issue was discovered in Tor before 0.4.6.5, aka TROVE-2021-006. The v3 onion service descriptor parsing allows out-of-bounds memory access, and a client crash, via a crafted onion service descriptor
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
6.5 Medium (CCN CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H)
5.7 Medium (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/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): Required
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
6.8 Medium (CCN CVSS v2 Vector: AV:N/AC:L/Au:S/C:N/I:N/A:C)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Low
Athentication (Au): Single_Instance
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): Complete
Vulnerability Type:CWE-119
Vulnerability Consequences:Denial of Service
References:Source: MITRE
Type: CNA
CVE-2021-34550

Source: CCN
Type: Tor Project Web site
New stable security releases: 0.3.5.15, 0.4.4.9, 0.4.5.9, 0.4.6.5

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

Source: XF
Type: UNKNOWN
tor-cve202134550-dos(203759)

Source: MISC
Type: Broken Link
https://gitlab.torproject.org/tpo/core/tor/-/issues/40392

Source: CCN
Type: Packet Storm Security [06-14-2021]
TOR Virtual Network Tunneling Tool 0.4.6.5

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

Source: CCN
Type: WhiteSource Vulnerability Database
CVE-2021-34550

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)

    • Configuration CCN 1:
  • cpe:/a:torproject:tor:0.3.5.14:*:*:*:*:*:*:*
  • OR cpe:/a:torproject:tor:0.4.4.8:*:*:*:*:*:*:*

    • * Denotes that component is vulnerable
    Oval Definitions
    Definition IDClassTitleLast 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
    torproject tor *
    torproject tor *
    torproject tor *
    torproject tor *
    torproject tor 0.3.5.14
    torproject tor 0.4.4.8