CVE-2018-1065

Published: 2 March 2018

The netfilter subsystem in the Linux kernel through 4.15.7 mishandles the case of a rule blob that contains a jump but lacks a user-defined chain, which allows local users to cause a denial of service (NULL pointer dereference) by leveraging the CAP_NET_RAW or CAP_NET_ADMIN capability, related to arpt_do_table in net/ipv4/netfilter/arp_tables.c, ipt_do_table in net/ipv4/netfilter/ip_tables.c, and ip6t_do_table in net/ipv6/netfilter/ip6_tables.c.

From the Ubuntu Security Team

It was discovered that the netfilter subsystem in the Linux kernel did not validate that rules containing jumps contained user-defined chains. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code.

Priority

Medium

CVSS 3 base score: 4.7

Status

References

• https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-1065
• http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=57ebd808a97d7c5b1e1afb937c2db22beba3c1f8
• http://lists.openwall.net/netdev/2018/01/27/46
• http://patchwork.ozlabs.org/patch/870355/
• https://bugzilla.redhat.com/show_bug.cgi?id=1547824
• https://github.com/torvalds/linux/commit/57ebd808a97d7c5b1e1afb937c2db22beba3c1f8
• https://ubuntu.com/security/notices/USN-3654-1
• https://ubuntu.com/security/notices/USN-3654-2
• https://ubuntu.com/security/notices/USN-3656-1
• NVD
• Launchpad
• Debian