Ubuntu.comUB:CVE-2016-1575CVE-2016-1575
7.8 High
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.2 High
CVSS2
Access Vector
LOCAL
Access Complexity
LOW
Authentication
NONE
Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
AV:L/AC:L/Au:N/C:C/I:C/A:C
0.0004 Low
EPSS
Percentile
11.9%
The overlayfs implementation in the Linux kernel through 4.5.2 does not
properly maintain POSIX ACL xattr data, which allows local users to gain
privileges by leveraging a group-writable setgid directory.
Bugs
Notes
| Author | Note |
|---|---|
| jdstrand | android kernels (flo, goldfish, grouper, maguro, mako and manta) are not supported on the Ubuntu Touch 14.10 and earlier preview kernels linux-lts-saucy no longer receives official support linux-lts-quantal no longer receives official support |
| sbeattie | precise does not allow unprivileged user namespaces, which is what lets an unprivileged user exploit this vulnerability; however, the issue of copying up setuid attributes still exists in the overlayfs codebase here, but it is a much lower priority to fix (needs root/CAP_SYS_ADMIN to exploit). |
| OS | Version | Architecture | Package | Version | Filename |
|---|---|---|---|---|---|
| ubuntu | 14.04 | noarch | linux | < 3.13.0-79.123 | UNKNOWN |
| ubuntu | 15.04 | noarch | linux | < 3.19.0-51.57 | UNKNOWN |
| ubuntu | 15.10 | noarch | linux | < 4.2.0-30.35 | UNKNOWN |
| ubuntu | 12.04 | noarch | linux-lts-trusty | < 3.13.0-79.123~precise1 | UNKNOWN |
| ubuntu | 14.04 | noarch | linux-lts-utopic | < 3.16.0-62.82~14.04.1 | UNKNOWN |
| ubuntu | 14.04 | noarch | linux-lts-vivid | < 3.19.0-51.57~14.04.1 | UNKNOWN |
| ubuntu | 14.04 | noarch | linux-lts-wily | < 4.2.0-30.35~14.04.1 | UNKNOWN |
| ubuntu | 15.10 | noarch | linux-raspi2 | < 4.2.0-1025.32 | UNKNOWN |
References
www.halfdog.net/Security/2016/UserNamespaceOverlayfsXattrSetgidPrivilegeEscalation/
git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux/+git/trusty/commit/?id=4dc7ebf4284cdc90e8f3cd617ed247aade2ca39f
launchpad.net/bugs/cve/CVE-2016-1575
nvd.nist.gov/vuln/detail/CVE-2016-1575
security-tracker.debian.org/tracker/CVE-2016-1575
ubuntu.com/security/notices/USN-2907-1
ubuntu.com/security/notices/USN-2907-2
ubuntu.com/security/notices/USN-2908-1
ubuntu.com/security/notices/USN-2908-2
ubuntu.com/security/notices/USN-2908-3
ubuntu.com/security/notices/USN-2909-1
ubuntu.com/security/notices/USN-2910-1
www.cve.org/CVERecord?id=CVE-2016-1575
Related
7.8 High
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.2 High
CVSS2
Access Vector
LOCAL
Access Complexity
LOW
Authentication
NONE
Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
AV:L/AC:L/Au:N/C:C/I:C/A:C
0.0004 Low
EPSS
Percentile
11.9%