Vulnerability Name:

CVE-2016-1576 (CCN-114463)

Assigned:2016-02-24
Published:2016-02-24
Updated:2022-04-18
Summary:The overlayfs implementation in the Linux kernel through 4.5.2 does not properly restrict the mount namespace, which allows local users to gain privileges by mounting an overlayfs filesystem on top of a FUSE filesystem, and then executing a crafted setuid program.
CVSS v3 Severity:7.8 High (CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H)
6.8 Medium (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C)
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): High
Availibility (A): High
7.4 High (CCN CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H)
6.4 Medium (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Local
Attack Complexity (AC): High
Privileges Required (PR): None
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): High
Integrity (I): High
Availibility (A): High
CVSS v2 Severity:7.2 High (CVSS v2 Vector: AV:L/AC:L/Au:N/C:C/I:C/A:C)
Exploitability Metrics:Access Vector (AV): Local
Access Complexity (AC): Low
Authentication (Au): None
Impact Metrics:Confidentiality (C): Complete
Integrity (I): Complete
Availibility (A): Complete
6.2 Medium (CCN CVSS v2 Vector: AV:L/AC:H/Au:N/C:C/I:C/A:C)
Exploitability Metrics:Access Vector (AV): Local
Access Complexity (AC): High
Athentication (Au): None
Impact Metrics:Confidentiality (C): Complete
Integrity (I): Complete
Availibility (A): Complete
Vulnerability Type:CWE-noinfo
Vulnerability Consequences:Gain Privileges
References:Source: MITRE
Type: CNA
CVE-2016-1576

Source: CCN
Type: Linux Kernel GIT Repository
Merge branch 'overlayfs-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/vfs

Source: MISC
Type: Mailing List, Patch, Vendor Advisory
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=e9f57ebcba563e0cd532926cab83c92bb4d79360

Source: CONFIRM
Type: Third Party Advisory
http://people.canonical.com/~ubuntu-security/cve/2016/CVE-2016-1576.html

Source: MISC
Type: Exploit, Third Party Advisory
http://www.halfdog.net/Security/2016/OverlayfsOverFusePrivilegeEscalation/

Source: CCN
Type: oss-sec Mailing List, Wed, 24 Feb 2016 06:03:35 +0000
Overlayfs over Fuse Privilege Escalation in USERNS

Source: MLIST
Type: Mailing List, Third Party Advisory
[oss-security] 20160224 Overlayfs over Fuse Privilege Escalation in USERNS

Source: MLIST
Type: Mailing List, Third Party Advisory
[oss-security] 20211018 Re: CVE-2021-3847: OverlayFS - Potential Privilege Escalation using overlays copy_up

Source: CONFIRM
Type: Third Party Advisory
https://bugs.launchpad.net/bugs/1535150

Source: XF
Type: UNKNOWN
linux-kernel-cve20161576-priv-esc(114463)

Source: MISC
Type: Mailing List, Patch, Third Party Advisory
https://launchpadlibrarian.net/235300093/0005-overlayfs-Be-more-careful-about-copying-up-sxid-file.patch

Source: MISC
Type: Mailing List, Patch, Third Party Advisory
https://launchpadlibrarian.net/235300225/0006-overlayfs-Propogate-nosuid-from-lower-and-upper-moun.patch

Vulnerable Configuration:Configuration 1:
  • cpe:/o:canonical:ubuntu_core:15.04:*:*:*:*:*:*:*
  • OR cpe:/o:canonical:ubuntu_touch:15.04:*:*:*:*:*:*:*
  • OR cpe:/o:canonical:ubuntu_linux:12.04:*:*:*:lts:*:*:*
  • OR cpe:/o:canonical:ubuntu_linux:14.04:*:*:*:lts:*:*:*
  • OR cpe:/o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*
  • OR cpe:/o:canonical:ubuntu_linux:15.10:*:*:*:*:*:*:*
  • OR cpe:/o:canonical:ubuntu_linux:16.10:*:*:*:*:*:*:*

    • Configuration 2:
  • cpe:/o:linux:linux_kernel:*:*:*:*:*:*:*:* (Version <= 4.5.2)

    • Configuration CCN 1:
  • cpe:/o:linux:linux_kernel:4.5:-:*:*:*:*:*:*

    • * Denotes that component is vulnerable
    Oval Definitions
    Definition IDClassTitleLast Modified
    oval:com.ubuntu.precise:def:20161576000
    V
    		CVE-2016-1576 on Ubuntu 12.04 LTS (precise) - high.
    2016-05-02
    oval:com.ubuntu.trusty:def:20161576000
    V
    		CVE-2016-1576 on Ubuntu 14.04 LTS (trusty) - high.
    2016-05-02
    oval:com.ubuntu.xenial:def:20161576000
    V
    		CVE-2016-1576 on Ubuntu 16.04 LTS (xenial) - high.
    2016-05-02
    oval:com.ubuntu.xenial:def:201615760000000
    V
    		CVE-2016-1576 on Ubuntu 16.04 LTS (xenial) - high.
    2016-05-02
    BACK
    canonical ubuntu core 15.04
    canonical ubuntu touch 15.04
    canonical ubuntu linux 12.04
    canonical ubuntu linux 14.04
    canonical ubuntu linux 16.04
    canonical ubuntu linux 15.10
    canonical ubuntu linux 16.10
    linux linux kernel *
    linux linux kernel 4.5