Resource exhaustion in F5 Big-Ip Access Policy Manager
CVE-2019-11479
Jonathan Looney discovered that the Linux kernel default MSS is hard-coded to 48 bytes. This allows a remote peer to fragment TCP resend queues significantly more than if a larger MSS were enforced. A remote attacker could use this to cause a denial of service. This has been fixed in stable kernel releases 4.4.182, 4.9.182, 4.14.127, 4.19.52, 5.1.11, and is fixed in commits 967c05aee439e6e5d7d805e195b3a20ef5c433d6 and 5f3e2bf008c2221478101ee72f5cb4654b9fc363.
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: 0.917 (99.8th percentile), scored .
High probability of exploitation in the next 30 days — patch promptly. 100th percentile — 99.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.917 · newest: 0.917 · 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
- www.securityfocus.com/bid/108818 (VDB Entry, Third Party Advisory, vdb-entry)
- www.kb.cert.org/vuls/id/905115 (US Government Resource, Third Party Advisory, third-party-advisory)
- access.redhat.com/errata/RHSA-2019:1594 (vendor-advisory, Third Party Advisory)
- access.redhat.com/errata/RHSA-2019:1602 (vendor-advisory, Third Party Advisory)
- www.openwall.com/lists/oss-security/2019/06/28/2 (mailing-list, Mailing List, Third Party Advisory)
- usn.ubuntu.com/4041-2/ (vendor-advisory, Third Party Advisory)
- www.openwall.com/lists/oss-security/2019/07/06/3 (mailing-list, Mailing List, Third Party Advisory)
- www.openwall.com/lists/oss-security/2019/07/06/4 (mailing-list, Mailing List, Third Party Advisory)
- access.redhat.com/errata/RHSA-2019:1699 (vendor-advisory, Third Party Advisory)
- usn.ubuntu.com/4041-1/ (vendor-advisory, Third Party Advisory)
Frequently asked questions
- What is CVE-2019-11479?
- CVE-2019-11479 is a high-severity vulnerability in F5 Big-Ip Access Policy Manager, classified under Asymmetric Resource Consumption (Amplification). CVSS score: 7.5/10. Published 2019-06-19.
- How severe is CVE-2019-11479?
- High severity. CVSS v3 base score is 7.5 out of 10.
- Is CVE-2019-11479 known to be exploited?
- 7 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.