Vulnerability CVE-2019-20637

Vulnerability Name:

CVE-2019-20637 (CCN-182329)

Assigned:

2019-10-21

Published:

2019-10-21

Updated:

2022-08-02

Summary:

An issue was discovered in Varnish Cache before 6.0.5 LTS, 6.1.x and 6.2.x before 6.2.2, and 6.3.x before 6.3.1. It does not clear a pointer between the handling of one client request and the next request within the same connection. This sometimes causes information to be disclosed from the connection workspace, such as data structures associated with previous requests within this connection or VCL-related temporary headers.

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:L/I:N/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:L/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): Low Integrity (I): None Availibility (A): None

3.1 Low (REDHAT CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N)
2.7 Low (REDHAT Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C)

Exploitability Metrics:	Attack Vector (AV): Network Attack Complexity (AC): High Privileges Required (PR): None User Interaction (UI): Required
Scope:	Scope (S): Unchanged
Impact Metrics:	Confidentiality (C): Low Integrity (I): None 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:P/I:N/A:N)

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

Vulnerability Type:

CWE-212
CWE-200

Vulnerability Consequences:

Obtain Information

References:

Source: MITRE
Type: CNA
CVE-2019-20637

Source: SUSE
Type: Mailing List, Third Party Advisory
openSUSE-SU-2020:0808

Source: SUSE
Type: Mailing List, Third Party Advisory
openSUSE-SU-2020:0819

Source: CCN
Type: Varnish Security Advisory VSV00004
Workspace information leak

Source: MISC
Type: Vendor Advisory
http://varnish-cache.org/security/VSV00004.html#vsv00004

Source: XF
Type: UNKNOWN
varnishcache-cve201920637-info-disc(182329)

Vulnerable Configuration:

Configuration 1:

cpe:/a:varnish-cache:varnish_cache:*:*:*:*:-:*:*:* (Version >= 6.1.0 and < 6.2.2)

OR cpe:/a:varnish-cache:varnish_cache:*:*:*:*:-:*:*:* (Version >= 6.3.0 and < 6.3.1)

OR cpe:/a:varnish-software:varnish_cache:*:*:*:*:lts:*:*:* (Version >= 6.0.0 and < 6.0.5)

Configuration 2:

cpe:/o:opensuse:leap:15.1:*:*:*:*:*:*:*

OR cpe:/a:opensuse:backports_sle:15.0:sp1:*:*:*:*:*:*

Configuration RedHat 1:

cpe:/a:redhat:enterprise_linux:8:*:*:*:*:*:*:*

Configuration RedHat 2:

cpe:/a:redhat:enterprise_linux:8::appstream:*:*:*:*:*

Denotes that component is vulnerable

Oval Definitions

Definition ID	Class	Title	Last Modified
oval:org.opensuse.security:def:93618	P	(Important)	2022-07-06
oval:org.opensuse.security:def:201920637	V	CVE-2019-20637	2021-10-24
oval:org.opensuse.security:def:64580	P	Security update for gd (Moderate)	2021-09-27
oval:org.opensuse.security:def:100331	P	(Important)	2021-09-23
oval:org.opensuse.security:def:64740	P	Security update for rpm (Important)	2021-08-12
oval:org.opensuse.security:def:63428	P	libexif12-32bit-0.6.21-5.3.1 on GA media (Moderate)	2021-08-10
oval:org.opensuse.security:def:64682	P	Security update for avahi (Moderate)	2021-05-04
oval:org.opensuse.security:def:64473	P	Security update for the Linux Kernel (Important)	2021-04-16
oval:org.opensuse.security:def:64472	P	Security update for clamav (Important)	2021-04-14
oval:org.opensuse.security:def:62957	P	jcl-over-slf4j-1.7.30-1.34 on GA media (Moderate)	2020-12-03
oval:org.opensuse.security:def:63631	P	libpoppler73-0.62.0-2.33 on GA media (Moderate)	2020-12-03
oval:org.opensuse.security:def:62925	P	rpm-build-4.14.1-10.16.1 on GA media (Moderate)	2020-12-03
oval:org.opensuse.security:def:62929	P	zlib-devel-32bit-1.2.11-3.6.4 on GA media (Moderate)	2020-12-03
oval:org.opensuse.security:def:63135	P	clamsap-0.99.25-2.37 on GA media (Moderate)	2020-12-03
oval:org.opensuse.security:def:62932	P	apache-commons-compress-1.19-1.63 on GA media (Moderate)	2020-12-03
oval:org.opensuse.security:def:74794	P	Security update for containerd, docker, docker-runc, golang-github-docker-libnetwork (Moderate)	2020-12-01
oval:org.opensuse.security:def:64336	P	libjasper4 on GA media (Moderate)	2020-12-01
oval:org.opensuse.security:def:74927	P	Security update for varnish (Moderate)	2020-12-01
oval:org.opensuse.security:def:63778	P	Security update for java-1_8_0-ibm (Important)	2020-12-01
oval:org.opensuse.security:def:64852	P	Security update for postgresql10 (Moderate)	2020-12-01
oval:org.opensuse.security:def:64007	P	Security update for libpng16 (Moderate)	2020-12-01
oval:com.redhat.rhsa:def:20204756	P	RHSA-2020:4756: varnish:6 security, bug fix, and enhancement update (Moderate)	2020-11-04
oval:org.opensuse.security:def:110589	P	Security update for varnish (Moderate)	2020-06-13

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