Privilege escalation in F5 Big-Ip Access Policy Manager
CVE-2018-13405
The inode_init_owner function in fs/inode.c in the Linux kernel through 3.16 allows local users to create files with an unintended group ownership, in a scenario where a directory is SGID to a certain group and is writable by a user who is not a member of that group. Here, the non-member can trigger creation of a plain file whose group ownership is that group. The intended behavior was that the non-member can trigger creation of a directory (but not a plain file) whose group ownership is that group. The non-member can escalate privileges by making the plain file executable and SGID.
Vulnerability class: Privilege Escalation
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.010 (63.3th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 63rd percentile — 63.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.010 · newest: 0.010 · change: +0.000
Affected products
- F5 Big-Ip Access Policy Manager — versions 15.1.0, 16.0.0
- F5 Big-Ip Advanced Firewall Manager — versions 15.1.0, 16.0.0
- F5 Big-Ip Analytics — versions 15.1.0, 16.0.0
- F5 Big-Ip Application Acceleration Manager — versions 15.1.0, 16.0.0
- F5 Big-Ip Application Security Manager — versions 15.1.0, 16.0.0
- F5 Big-Ip Domain Name System — versions 15.1.0, 16.0.0
- F5 Big-Ip Edge Gateway — versions 15.1.0, 16.0.0
- F5 Big-Ip Fraud Protection Service — versions 15.1.0, 16.0.0
- F5 Big-Ip Global Traffic Manager — versions 15.1.0, 16.0.0
- F5 Big-Ip Link Controller — versions 15.1.0, 16.0.0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- usn.ubuntu.com/3752-2/ (vendor-advisory, Third Party Advisory)
- access.redhat.com/errata/RHSA-2018:3083 (vendor-advisory, Third Party Advisory)
- usn.ubuntu.com/3752-3/ (vendor-advisory, Third Party Advisory)
- twitter.com/grsecurity/status/1015082951204327425 (Third Party Advisory)
- usn.ubuntu.com/3753-2/ (vendor-advisory, Third Party Advisory)
- usn.ubuntu.com/3754-1/ (vendor-advisory, Third Party Advisory)
- openwall.com/lists/oss-security/2018/07/13/2 (Patch, Mailing List, Third Party Advisory)
- access.redhat.com/errata/RHSA-2018:2948 (vendor-advisory, Third Party Advisory)
- git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/ (Patch, Vendor Advisory)
- lists.debian.org/debian-lts-announce/2018/08/msg00014.html (mailing-list, Third Party Advisory)
Frequently asked questions
- What is CVE-2018-13405?
- CVE-2018-13405 is a high-severity vulnerability in F5 Big-Ip Access Policy Manager, classified under Improper Privilege Management. CVSS score: 7.8/10. Published 2018-07-06.
- How severe is CVE-2018-13405?
- High severity. CVSS v3 base score is 7.8 out of 10.
- Is CVE-2018-13405 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.