CVE-2017-5972

The TCP stack in the Linux kernel 3.x does not properly implement a SYN cookie protection mechanism for the case of a fast network connection, which allows remote attackers to cause a denial of service (CPU consumption) by sending many TCP SYN packets, as demonstrated by an attack against the kernel-3.10.0 package in CentOS Linux 7. NOTE: third parties have been unable to discern any relationship between the GitHub Engineering finding and the Trigemini.c attack code.

Weakness

The product does not properly control the allocation and maintenance of a limited resource.

Affected Software

Potential Mitigations

• Mitigation of resource exhaustion attacks requires that the target system either:

• The first of these solutions is an issue in itself though, since it may allow attackers to prevent the use of the system by a particular valid user. If the attacker impersonates the valid user, they may be able to prevent the user from accessing the server in question.

• The second solution is simply difficult to effectively institute – and even when properly done, it does not provide a full solution. It simply makes the attack require more resources on the part of the attacker.

Related Attack Patterns

• https://cwe.mitre.org/data/definitions/147.html
• https://cwe.mitre.org/data/definitions/227.html
• https://cwe.mitre.org/data/definitions/492.html

References

• http://seclists.org/oss-sec/2017/q1/573
• http://www.securityfocus.com/bid/96231
• https://access.redhat.com/security/cve/cve-2017-5972
• https://bugzilla.redhat.com/show_bug.cgi?id=1422081
• https://cxsecurity.com/issue/WLB-2017020112
• https://githubengineering.com/syn-flood-mitigation-with-synsanity/
• https://packetstormsecurity.com/files/141083/CentOS7-Kernel-Denial-Of-Service.html
• https://security-tracker.debian.org/tracker/CVE-2017-5972
• https://www.exploit-db.com/exploits/41350/
• http://seclists.org/oss-sec/2017/q1/573
• http://www.securityfocus.com/bid/96231
• https://access.redhat.com/security/cve/cve-2017-5972
• https://bugzilla.redhat.com/show_bug.cgi?id=1422081
• https://cxsecurity.com/issue/WLB-2017020112
• https://githubengineering.com/syn-flood-mitigation-with-synsanity/
• https://packetstormsecurity.com/files/141083/CentOS7-Kernel-Denial-Of-Service.html
• https://security-tracker.debian.org/tracker/CVE-2017-5972
• https://www.exploit-db.com/exploits/41350/