Vulnerability CVE-2013-1956

Vulnerability Name:

CVE-2013-1956 (CCN-83788)

Assigned:

2013-03-27

Published:

2013-03-27

Updated:

2023-02-13

Summary:

Linux Kernel could allow a local attacker to bypass security restrictions, caused by the failure to check whether a chroot directory exists that differs from the namespace root directory by the create_user_ns function. An attacker could exploit this vulnerability using a specially-crafted clone system call to bypass filesystem restrictions.

CVSS v3 Severity:

4.0 Medium (CCN CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N)

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): Low Availibility (A): None

CVSS v2 Severity:

2.1 Low (CVSS v2 Vector: AV:L/AC:L/Au:N/C:N/I:P/A:N)
1.6 Low (Temporal CVSS v2 Vector: AV:L/AC:L/Au:N/C:N/I:P/A:N/E:U/RL:OF/RC:C)

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

2.1 Low (CCN CVSS v2 Vector: AV:L/AC:L/Au:N/C:N/I:P/A:N)
1.6 Low (CCN Temporal CVSS v2 Vector: AV:L/AC:L/Au:N/C:N/I:P/A:N/E:U/RL:OF/RC:C)

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

Vulnerability Consequences:

Bypass Security

References:

Source: MITRE
Type: CNA
CVE-2013-1956

Source: secalert@redhat.com
Type: UNKNOWN
secalert@redhat.com

Source: CCN
Type: Linux Kernel GIT Repository
userns: Don't allow creation if the user is chrooted

Source: secalert@redhat.com
Type: UNKNOWN
secalert@redhat.com

Source: secalert@redhat.com
Type: UNKNOWN
secalert@redhat.com

Source: XF
Type: UNKNOWN
linux-cve20131956-sec-bypass(83788)

Source: secalert@redhat.com
Type: UNKNOWN
secalert@redhat.com

Vulnerable Configuration:

Configuration CCN 1:

cpe:/o:linux:linux_kernel:3.8.3:*:*:*:*:*:*:*

OR cpe:/o:linux:linux_kernel:3.8.2:*:*:*:*:*:*:*

OR cpe:/o:linux:linux_kernel:3.8.1:*:*:*:*:*:*:*

OR cpe:/o:linux:linux_kernel:3.8.0:*:*:*:*:*:*:*

OR cpe:/o:linux:linux_kernel:3.8.4:*:*:*:*:*:*:*

OR cpe:/o:linux:linux_kernel:3.8.5:*:*:*:*:*:*:*

Denotes that component is vulnerable

Oval Definitions

Definition ID	Class	Title	Last Modified
oval:com.ubuntu.precise:def:20131956000	V	CVE-2013-1956 on Ubuntu 12.04 LTS (precise) - medium.	2013-04-24
oval:com.ubuntu.trusty:def:20131956000	V	CVE-2013-1956 on Ubuntu 14.04 LTS (trusty) - medium.	2013-04-24
oval:com.ubuntu.xenial:def:20131956000	V	CVE-2013-1956 on Ubuntu 16.04 LTS (xenial) - medium.	2013-04-24
oval:com.ubuntu.xenial:def:201319560000000	V	CVE-2013-1956 on Ubuntu 16.04 LTS (xenial) - medium.	2013-04-24

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