Remote denial of service in OpenBSD
| Risk | Medium |
| Patch available | YES |
| Number of vulnerabilities | 1 |
| CVE-ID | CVE-2019-8460 |
| CWE-ID | CWE-400 |
| Exploitation vector | Network |
| Public exploit | Public exploit code for vulnerability #1 is available. |
| Vulnerable software Subscribe |
OpenBSD Operating systems & Components / Operating system |
| Vendor | OpenBSD |
Security Bulletin
This security bulletin contains one medium risk vulnerability.
1) Resource exhaustion
EUVDB-ID: #VU23427
Risk: Medium
CVSSv3.1: 6.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C]
CVE-ID: CVE-2019-8460
CWE-ID:
CWE-400 - Resource exhaustion
Exploit availability: Yes
DescriptionThe vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to an error when processing TCP SACK packets. A remote attacker can force the system to create long chains of TCP SACK holes that causes very expensive calls to tcp_sack_option() for every incoming SACK packet.
Successful exploitation of the vulnerability may result in a denial of service (DoS) attack.
Install updates from vendor's website.
Vulnerable software versionsOpenBSD: 6.0 - 6.5
External linkshttp://ftp.openbsd.org/pub/OpenBSD/patches/6.5/common/006_tcpsack.patch.sig
http://github.com/openbsd/src/commit/ed8fdce754a5d8d14c09e989d8877707bd43906f
http://research.checkpoint.com/tcp-sack-security-issue-in-openbsd-cve-2019-8460/
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.
