Vulnerability Name:

CVE-2015-4176 (CCN-103943)

Assigned:2015-05-29
Published:2015-05-29
Updated:2016-05-05
Summary:fs/namespace.c in the Linux kernel before 4.0.2 does not properly support mount connectivity, which allows local users to read arbitrary files by leveraging user-namespace root access for deletion of a file or directory.
CVSS v3 Severity:5.5 Medium (CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N)
Exploitability Metrics:Attack Vector (AV): Local
Attack Complexity (AC): Low
Privileges Required (PR): Low
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): High
Integrity (I): None
Availibility (A): None
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)
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: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
4.7 Medium (CCN CVSS v2 Vector: AV:L/AC:M/Au:N/C:N/I:N/A:C)
3.5 Low (CCN Temporal CVSS v2 Vector: AV:L/AC:M/Au:N/C:N/I:N/A:C/E:U/RL:OF/RC:C)
Exploitability Metrics:Access Vector (AV): Local
Access Complexity (AC): Medium
Athentication (Au): None
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): Complete
Vulnerability Type:CWE-200
Vulnerability Consequences:Denial of Service
References:Source: MITRE
Type: CNA
CVE-2015-4176

Source: CONFIRM
Type: Vendor Advisory
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=e0c9c0afd2fc958ffa34b697972721d81df8a56f

Source: CCN
Type: oss-security Mailing List, Fri, 29 May 2015 22:05:26 +0530 (IST)
CVE request Linux kernel: ns: user namespaces panic

Source: CCN
Type: oss-security Mailing List, Thu, 4 Jun 2015 09:57:44 -0400 (EDT)
Re: CVE request Linux kernel: ns: user namespaces panic

Source: CONFIRM
Type: UNKNOWN
http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.0.2

Source: MLIST
Type: UNKNOWN
[oss-security] 20150604 Re: Re: CVE request Linux kernel: ns: user namespaces panic

Source: CONFIRM
Type: UNKNOWN
https://bugzilla.redhat.com/show_bug.cgi?id=1249442

Source: XF
Type: UNKNOWN
linux-kernel-cve20154176-dos(103943)

Source: CCN
Type: Linux Kernel GIT Repository
fs_pin: Allow for the possibility that m_list or s_list go unused

Source: CONFIRM
Type: Vendor Advisory
https://github.com/torvalds/linux/commit/e0c9c0afd2fc958ffa34b697972721d81df8a56f

Vulnerable Configuration:Configuration 1:
  • cpe:/o:linux:linux_kernel:*:*:*:*:*:*:*:* (Version <= 4.0.1)

  • Configuration CCN 1:
  • cpe:/o:linux:linux_kernel:*:*:*:*:*:*:*:*

  • * Denotes that component is vulnerable
    Oval Definitions
    Definition IDClassTitleLast Modified
    oval:com.ubuntu.precise:def:20154176000
    V
    CVE-2015-4176 on Ubuntu 12.04 LTS (precise) - medium.
    2016-05-02
    oval:com.ubuntu.trusty:def:20154176000
    V
    CVE-2015-4176 on Ubuntu 14.04 LTS (trusty) - medium.
    2016-05-02
    oval:com.ubuntu.xenial:def:20154176000
    V
    CVE-2015-4176 on Ubuntu 16.04 LTS (xenial) - medium.
    2016-05-02
    oval:com.ubuntu.xenial:def:201541760000000
    V
    CVE-2015-4176 on Ubuntu 16.04 LTS (xenial) - medium.
    2016-05-02
    BACK
    linux linux kernel *
    linux linux kernel *