CVE-2019-5599
First published: Tue Jul 02 2019(Updated: )
In FreeBSD 12.0-STABLE before r349197 and 12.0-RELEASE before 12.0-RELEASE-p6, a bug in the non-default RACK TCP stack can allow an attacker to cause several linked lists to grow unbounded and cause an expensive list traversal on every packet being processed, leading to resource exhaustion and a denial of service.
Credit: secteam@freebsd.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| FreeBSD Kernel | =12.0 | |
| FreeBSD Kernel | =12.0-p1 | |
| FreeBSD Kernel | =12.0-p2 | |
| FreeBSD Kernel | =12.0-p3 | |
| FreeBSD Kernel | =12.0-p4 | |
| FreeBSD Kernel | =12.0-p5 |
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Reference Links
- http://packetstormsecurity.com/files/153329/Linux-FreeBSD-TCP-Based-Denial-Of-Service.html
- http://packetstormsecurity.com/files/153378/FreeBSD-Security-Advisory-FreeBSD-SA-19-08.rack.html
- http://www.openwall.com/lists/oss-security/2019/06/17/5
- https://github.com/Netflix/security-bulletins/blob/master/advisories/third-party/2019-001.md
- https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44193
- https://seclists.org/bugtraq/2019/Jun/27
- https://security.FreeBSD.org/advisories/FreeBSD-SA-19:08.rack.asc
- https://security.netapp.com/advisory/ntap-20190625-0004/
- https://support.f5.com/csp/article/K75521003
- https://www.kb.cert.org/vuls/id/905115
Frequently Asked Questions
What is the severity of CVE-2019-5599?
CVE-2019-5599 is classified as a high severity vulnerability due to the potential for resource exhaustion and denial of service.
How do I fix CVE-2019-5599?
To remediate CVE-2019-5599, update your FreeBSD system to version 12.0-RELEASE-p6 or later.
What versions of FreeBSD are affected by CVE-2019-5599?
FreeBSD versions 12.0 through 12.0-RELEASE-p5 are affected by CVE-2019-5599.
What type of attack does CVE-2019-5599 facilitate?
CVE-2019-5599 allows attackers to exploit a bug in the RACK TCP stack, leading to denial of service through resource exhaustion.
Is there a workaround for CVE-2019-5599?
While updating is the recommended approach, temporarily disabling the RACK TCP stack may help mitigate the issue until a patch is applied.
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- version/freebsd kernel/12.0
- version/freebsd kernel/12.0-p1
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- version/freebsd kernel/12.0-p4
- version/freebsd kernel/12.0-p5