Vulnerability CVE-2021-20275

Vulnerability Name:

CVE-2021-20275 (CCN-197564)

Assigned:

2020-12-17

Published:

2021-02-28

Updated:

2022-08-05

Summary:

A flaw was found in privoxy before 3.0.32. A invalid read of size two may occur in chunked_body_is_complete() leading to denial of service.

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-125

Vulnerability Consequences:

Denial of Service

References:

Source: MITRE
Type: CNA
CVE-2021-20275

Source: MISC
Type: Issue Tracking, Patch, Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1936666

Source: XF
Type: UNKNOWN
privoxy-chunkedbodyiscomplete-dos(197564)

Source: MLIST
Type: Third Party Advisory
[debian-lts-announce] 20210309 [SECURITY] [DLA 2587-1] privoxy security update

Source: CCN
Type: oss-sec Mailing List, Sun, 28 Feb 2021 10:23:46 +0100
Multiple DoS issues fixed in Privoxy 3.0.32 stable

Source: GENTOO
Type: Third Party Advisory
GLSA-202107-16

Source: CCN
Type: Privoxy Web site
Privoxy

Source: MISC
Type: Release Notes, Vendor Advisory
https://www.privoxy.org/announce.txt

Vulnerable Configuration:

Configuration 1:

cpe:/a:privoxy:privoxy:*:*:*:*:*:*:*:* (Version < 3.0.32)

Configuration 2:

cpe:/o:debian:debian_linux:9.0:*:*:*:*:*:*:*

Denotes that component is vulnerable

Oval Definitions

Definition ID	Class	Title	Last Modified
oval:org.opensuse.security:def:113171	P	privoxy-3.0.32-2.3 on GA media (Moderate)	2022-01-17
oval:org.opensuse.security:def:106594	P	privoxy-3.0.32-2.3 on GA media (Moderate)	2021-10-01
oval:org.opensuse.security:def:11190	P	Security update for privoxy (Moderate)	2021-03-22
oval:org.opensuse.security:def:96459	P	Security update for privoxy (Moderate)	2021-03-22
oval:org.opensuse.security:def:103149	P	Security update for privoxy (Moderate)	2021-03-22
oval:org.opensuse.security:def:109806	P	Security update for privoxy (Moderate)	2021-03-22
oval:org.opensuse.security:def:111278	P	Security update for privoxy (Moderate)	2021-03-18

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