CVE-2017-18017

Published: 3 January 2018

The tcpmss_mangle_packet function in net/netfilter/xt_TCPMSS.c in the Linux kernel before 4.11, and 4.9.x before 4.9.36, allows remote attackers to cause a denial of service (use-after-free and memory corruption) or possibly have unspecified other impact by leveraging the presence of xt_TCPMSS in an iptables action.

From the Ubuntu security team

Denys Fedoryshchenko discovered a use-after-free vulnerability in the netfilter xt_TCPMSS filter of the Linux kernel. A remote attacker could use this to cause a denial of service (system crash).

Priority

Medium

CVSS 3 base score: 9.8

Status

References

• https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-18017
• http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=2638fd0f92d4397884fd991d8f4925cb3f081901
• http://patchwork.ozlabs.org/patch/746618/
• https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1739765
• https://github.com/torvalds/linux/commit/2638fd0f92d4397884fd991d8f4925cb3f081901
• https://lkml.org/lkml/2017/4/2/13
• https://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.9.36
• https://ubuntu.com/security/notices/USN-3583-1
• https://ubuntu.com/security/notices/USN-3583-2
• NVD
• Launchpad
• Debian

Bugs