Resource exhaustion in F5 Big-Ip Access Policy Manager
CVE-2018-5391
The Linux kernel, versions 3.9+, is vulnerable to a denial of service attack with low rates of specially modified packets targeting IP fragment re-assembly. An attacker may cause a denial of service condition by sending specially crafted IP fragments. Various vulnerabilities in IP fragmentation have been discovered and fixed over the years. The current vulnerability (CVE-2018-5391) became exploitable in the Linux kernel with the increase of the IP fragment reassembly queue size.
Vulnerability class: DoS (Denial of Service)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.324 (98.3th percentile), scored .
Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 98th percentile — 98.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.324 · newest: 0.324 · change: 0.000
Affected products
- F5 Big-Ip Access Policy Manager
- F5 Big-Ip Advanced Firewall Manager
- F5 Big-Ip Analytics
- F5 Big-Ip Application Acceleration Manager
- F5 Big-Ip Application Security Manager
- F5 Big-Ip Domain Name System
- F5 Big-Ip Edge Gateway
- F5 Big-Ip Fraud Protection Service
- F5 Big-Ip Global Traffic Manager
- F5 Big-Ip Link Controller
Weakness classification (CWE)
Public proof-of-concept exploits
References
- access.redhat.com/errata/RHSA-2018:3540 (vendor-advisory, Third Party Advisory)
- access.redhat.com/errata/RHSA-2018:2785 (vendor-advisory, Third Party Advisory)
- access.redhat.com/errata/RHSA-2018:3083 (vendor-advisory, Third Party Advisory)
- access.redhat.com/errata/RHSA-2018:2925 (vendor-advisory, Third Party Advisory)
- www.kb.cert.org/vuls/id/641765 (US Government Resource, Third Party Advisory, third-party-advisory)
- www.arubanetworks.com/assets/alert/ARUBA-PSA-2018-004.txt (Third Party Advisory)
- usn.ubuntu.com/3741-2/ (vendor-advisory, Third Party Advisory)
- www.securitytracker.com/id/1041476 (VDB Entry, Third Party Advisory, vdb-entry)
- access.redhat.com/errata/RHSA-2018:3459 (vendor-advisory, Third Party Advisory)
- git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git/commit/ (Patch, Vendor Advisory)
Frequently asked questions
- What is CVE-2018-5391?
- CVE-2018-5391 is a high-severity vulnerability in F5 Big-Ip Access Policy Manager, classified under Uncontrolled Resource Consumption. CVSS score: 7.5/10. Published 2018-09-06.
- How severe is CVE-2018-5391?
- High severity. CVSS v3 base score is 7.5 out of 10.
- Is CVE-2018-5391 known to be exploited?
- 3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.