Vulnerability CVE-2019-20795

Vulnerability Name:

CVE-2019-20795 (CCN-181917)

Assigned:

2020-05-09

Published:

2020-05-09

Updated:

2020-09-10

Summary:

iproute2 before 5.1.0 has a use-after-free in get_netnsid_from_name in ip/ipnetns.c.
Note: security relevance may be limited to certain uses of setuid that, although not a default, are sometimes a configuration option offered to end users. Even when setuid is used, other factors (such as C library configuration) may block exploitability.

CVSS v3 Severity:

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

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

6.2 Medium (CCN CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
5.4 Medium (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:L/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): Local 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:

2.1 Low (CVSS v2 Vector: AV:L/AC:L/Au:N/C:N/I:N/A:P)

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

4.9 Medium (CCN CVSS v2 Vector: AV:L/AC:L/Au:N/C:N/I:N/A:C)

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

Vulnerability Type:

CWE-416

Vulnerability Consequences:

Denial of Service

References:

Source: MITRE
Type: CNA
CVE-2019-20795

Source: CCN
Type: Bugzilla Bug 1171452
CVE-2019-20795: iproute2: use-after-free in get_netnsid_from_name in ip/ipnetns.c

Source: MISC
Type: Issue Tracking, Third Party Advisory
https://bugzilla.suse.com/show_bug.cgi?id=1171452

Source: XF
Type: UNKNOWN
iproute2-cve201920795-dos(181917)

Source: CCN
Type: iproute2 GIT Repository
ipnetns: use-after-free problem in get_netnsid_from_name func

Source: CONFIRM
Type: Patch, Third Party Advisory
https://git.kernel.org/pub/scm/network/iproute2/iproute2.git/commit/?id=9bf2c538a0eb10d66e2365a655bf6c52f5ba3d10

Source: GENTOO
Type: Third Party Advisory
GLSA-202008-06

Source: UBUNTU
Type: Third Party Advisory
USN-4357-1

Vulnerable Configuration:

Configuration 1:

cpe:/a:iproute2_project:iproute2:*:*:*:*:*:*:*:* (Version < 5.1.0)

Configuration 2:

cpe:/o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*

Configuration CCN 1:

cpe:/a:iproute2_project:iproute2:4.15.0:*:*:*:*:*:*:*

OR cpe:/a:iproute2_project:iproute2:4.16.0:*:*:*:*:*:*:*

OR cpe:/a:iproute2_project:iproute2:4.17.0:*:*:*:*:*:*:*

OR cpe:/a:iproute2_project:iproute2:4.18.0:*:*:*:*:*:*:*

OR cpe:/a:iproute2_project:iproute2:4.19.0:*:*:*:*:*:*:*

OR cpe:/a:iproute2_project:iproute2:4.20.0:*:*:*:*:*:*:*

OR cpe:/a:iproute2_project:iproute2:5.0.0:*:*:*:*:*:*:*

Denotes that component is vulnerable

Oval Definitions

Definition ID	Class	Title	Last Modified
oval:org.opensuse.security:def:26149	P	Security update for iproute2 (Moderate)	2021-10-18
oval:org.opensuse.security:def:34565	P	Security update for iproute2 (Moderate)	2021-10-18
oval:org.opensuse.security:def:60388	P	Security update for iproute2 (Moderate)	2021-10-18
oval:org.opensuse.security:def:5136	P	Security update for iproute2 (Moderate)	2021-10-18

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