Vulnerability CVE-2015-2689

Vulnerability Name:

CVE-2015-2689 (CCN-176952)

Assigned:

2015-02-28

Published:

2015-02-28

Updated:

2020-01-31

Summary:

Tor before 0.2.4.26 and 0.2.5.x before 0.2.5.11 does not properly handle pending-connection resolve states during periods of high DNS load, which allows remote attackers to cause a denial of service (assertion failure and daemon exit) via crafted packets.

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-20

Vulnerability Consequences:

Denial of Service

References:

Source: MITRE
Type: CNA
CVE-2015-2689

Source: XF
Type: UNKNOWN
tor-cve20152689-dos(176952)

Source: MISC
Type: Mailing List, Vendor Advisory
https://lists.torproject.org/pipermail/tor-talk/2015-March/037281.html

Source: CCN
Type: Tor #14129
Assertion failure in dns.c, possibly connected to UDP DoS attack

Source: MISC
Type: Patch, Vendor Advisory
https://trac.torproject.org/projects/tor/ticket/14129

Source: CCN
Type: Tor Web site
Tor

Source: CCN
Type: WhiteSource Vulnerability Database
CVE-2015-2689

Vulnerable Configuration:

Configuration 1:

cpe:/a:torproject:tor:*:*:*:*:*:*:*:* (Version < 0.2.4.26)

OR cpe:/a:torproject:tor:*:*:*:*:*:*:*:* (Version >= 0.2.5.1 and < 0.2.5.11)

Configuration CCN 1:

cpe:/a:elementor:elementor_page_builder:0.2.5:*:*:*:*:wordpress:*:*

OR cpe:/a:elementor:elementor_page_builder:0.2.4:*:*:*:*:wordpress:*:*

Denotes that component is vulnerable

Oval Definitions

Definition ID	Class	Title	Last Modified
oval:org.opensuse.security:def:20152689	V	CVE-2015-2689	2022-06-30
oval:org.opensuse.security:def:113538	P	tor-0.2.8.11-1.1 on GA media (Moderate)	2022-01-17
oval:org.opensuse.security:def:106933	P	tor-0.2.8.11-1.1 on GA media (Moderate)	2021-10-01
oval:com.ubuntu.xenial:def:201526890000000	V	CVE-2015-2689 on Ubuntu 16.04 LTS (xenial) - low.	2020-01-24
oval:org.cisecurity:def:55	P	DSA-3203-1 -- tor -- security update	2016-02-08
oval:com.ubuntu.precise:def:20152689000	V	CVE-2015-2689 on Ubuntu 12.04 LTS (precise) - low.	2015-03-22
oval:com.ubuntu.trusty:def:20152689000	V	CVE-2015-2689 on Ubuntu 14.04 LTS (trusty) - low.	2015-03-22
oval:com.ubuntu.xenial:def:20152689000	V	CVE-2015-2689 on Ubuntu 16.04 LTS (xenial) - low.	2015-03-22

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