Resource exhaustion in F5 Big-Ip Access Policy Manager
CVE-2019-11478
Jonathan Looney discovered that the TCP retransmission queue implementation in tcp_fragment in the Linux kernel could be fragmented when handling certain TCP Selective Acknowledgment (SACK) sequences. 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 commit f070ef2ac66716357066b683fb0baf55f8191a2e.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.
EPSS exploit prediction
EPSS: 0.947 (99.9th percentile), scored .
High probability of exploitation in the next 30 days — patch promptly. 100th percentile — 99.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.947 · newest: 0.947 · change: 0.000
Affected products
- F5 Big-Ip Access Policy Manager — versions 15.0.0
- F5 Big-Ip Advanced Firewall Manager — versions 15.0.0
- F5 Big-Ip Analytics — versions 15.0.0
- F5 Big-Ip Application Acceleration Manager — versions 15.0.0
- F5 Big-Ip Application Security Manager — versions 15.0.0
- F5 Big-Ip Domain Name System — versions 15.0.0
- F5 Big-Ip Edge Gateway — versions 15.0.0
- F5 Big-Ip Fraud Protection Service — versions 15.0.0
- F5 Big-Ip Global Traffic Manager — versions 15.0.0
- F5 Big-Ip Link Controller — versions 15.0.0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- www.kb.cert.org/vuls/id/905115 (third-party-advisory)
- access.redhat.com/errata/RHSA-2019:1594 (vendor-advisory)
- access.redhat.com/errata/RHSA-2019:1602 (vendor-advisory)
- www.openwall.com/lists/oss-security/2019/06/28/2 (mailing-list)
- www.openwall.com/lists/oss-security/2019/07/06/3 (mailing-list)
- www.openwall.com/lists/oss-security/2019/07/06/4 (mailing-list)
- access.redhat.com/errata/RHSA-2019:1699 (vendor-advisory)
- seclists.org/bugtraq/2019/Jul/30 (mailing-list)
- www.openwall.com/lists/oss-security/2019/10/24/1 (mailing-list)
- www.openwall.com/lists/oss-security/2019/10/29/3 (mailing-list)
Frequently asked questions
- What is CVE-2019-11478?
- CVE-2019-11478 is a medium-severity vulnerability in F5 Big-Ip Access Policy Manager, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 5.3/10. Published 2019-06-19.
- How severe is CVE-2019-11478?
- Medium severity. CVSS v3 base score is 5.3 out of 10.
- Is CVE-2019-11478 known to be exploited?
- 7 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.