Vulnerability Name:

CVE-2017-0377 (CCN-130529)

Assigned:2016-11-29
Published:2017-06-29
Updated:2017-07-14
Summary:Tor 0.3.x before 0.3.0.9 has a guard-selection algorithm that only considers the exit relay (not the exit relay's family), which might allow remote attackers to defeat intended anonymity properties by leveraging the existence of large families.
CVSS v3 Severity:7.5 High (CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N)
6.5 Medium (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/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): High
Integrity (I): None
Availibility (A): None
5.3 Medium (CCN CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N)
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:L/A:N/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): Low
Availibility (A): None
CVSS v2 Severity:5.0 Medium (CVSS v2 Vector: AV:N/AC:L/Au:N/C:P/I:N/A:N)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Low
Authentication (Au): None
Impact Metrics:Confidentiality (C): Partial
Integrity (I): None
Availibility (A): None
5.0 Medium (CCN CVSS v2 Vector: AV:N/AC:L/Au:N/C:N/I:P/A:N)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Low
Athentication (Au): None
Impact Metrics:Confidentiality (C): None
Integrity (I): Partial
Availibility (A): None
Vulnerability Type:CWE-200
Vulnerability Consequences:Gain Access
References:Source: MITRE
Type: CNA
CVE-2017-0377

Source: CCN
Type: Tor Blog, June 29, 2017
Tor 0.3.0.9 is released (with security update for clients)

Source: CONFIRM
Type: Release Notes, Vendor Advisory
https://blog.torproject.org/blog/tor-0309-released-security-update-clients

Source: CONFIRM
Type: Release Notes, Vendor Advisory
https://blog.torproject.org/blog/tor-0314-alpha-released-security-update-clients

Source: XF
Type: UNKNOWN
tor-cve20170377-weak-security(130529)

Source: CONFIRM
Type: Patch, Third Party Advisory
https://github.com/torproject/tor/commit/665baf5ed5c6186d973c46cdea165c0548027350

Source: CONFIRM
Type: Third Party Advisory
https://security-tracker.debian.org/CVE-2017-0377

Source: CONFIRM
Type: Issue Tracking, Vendor Advisory
https://trac.torproject.org/projects/tor/ticket/22753

Source: CCN
Type: Tor Web site
Tor Project: Anonymity Online

Vulnerable Configuration:Configuration 1:
  • cpe:/a:torproject:tor:0.3.0.1:alpha:*:*:*:*:*:*
  • OR cpe:/a:torproject:tor:0.3.0.2:alpha:*:*:*:*:*:*
  • OR cpe:/a:torproject:tor:0.3.0.3:alpha:*:*:*:*:*:*
  • OR cpe:/a:torproject:tor:0.3.0.4:*:*:*:*:*:*:*
  • OR cpe:/a:torproject:tor:0.3.0.5:*:*:*:*:*:*:*
  • OR cpe:/a:torproject:tor:0.3.0.6:*:*:*:*:*:*:*
  • OR cpe:/a:torproject:tor:0.3.0.7:*:*:*:*:*:*:*
  • OR cpe:/a:torproject:tor:0.3.0.8:*:*:*:*:*:*:*

    • * 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:com.ubuntu.xenial:def:201703770000000
    V
    		CVE-2017-0377 on Ubuntu 16.04 LTS (xenial) - medium.
    2017-07-02
    oval:com.ubuntu.artful:def:20170377000
    V
    		CVE-2017-0377 on Ubuntu 17.10 (artful) - medium.
    2017-07-02
    oval:com.ubuntu.xenial:def:20170377000
    V
    		CVE-2017-0377 on Ubuntu 16.04 LTS (xenial) - medium.
    2017-07-02
    oval:com.ubuntu.bionic:def:20170377000
    V
    		CVE-2017-0377 on Ubuntu 18.04 LTS (bionic) - medium.
    2017-07-02
    oval:com.ubuntu.cosmic:def:201703770000000
    V
    		CVE-2017-0377 on Ubuntu 18.10 (cosmic) - medium.
    2017-07-02
    oval:com.ubuntu.cosmic:def:20170377000
    V
    		CVE-2017-0377 on Ubuntu 18.10 (cosmic) - medium.
    2017-07-02
    oval:com.ubuntu.bionic:def:201703770000000
    V
    		CVE-2017-0377 on Ubuntu 18.04 LTS (bionic) - medium.
    2017-07-02
    oval:com.ubuntu.trusty:def:20170377000
    V
    		CVE-2017-0377 on Ubuntu 14.04 LTS (trusty) - medium.
    2017-07-02
    BACK
    torproject tor 0.3.0.1 alpha
    torproject tor 0.3.0.2 alpha
    torproject tor 0.3.0.3 alpha
    torproject tor 0.3.0.4
    torproject tor 0.3.0.5
    torproject tor 0.3.0.6
    torproject tor 0.3.0.7
    torproject tor 0.3.0.8