oss-sec mailing list archives
CVE-2021-20177 kernel: iptables string match rule could result in kernel panic
From: Wade Mealing <wmealing () redhat com>
Date: Tue, 12 Jan 2021 16:58:07 +1000
Gday, A flaw was found in the Linux kernels implementation of string matching within a packet. A privileged user (with root or CAP_NET_ADMIN ) when inserting iptables rules could insert a rule which can panic the system. Likely a user with these permissions could do worse, however it crashes the system (DOS) and the user is going to have a bad day especially if the rule is inserted and restored on every boot. At this time it doesn't affect RHEL releases, and there are fixes already in multiple upstream trees. Thanks, Wade Mealing Upstream patch: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=ca58fbe06c54 Upstream bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=209823 Red Hat Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=1914719 -- Wade Mealing Product Security - Kernel, RHCE Red Hat <https://www.redhat.com> wmealing () redhat com <https://red.ht/sig> TRIED. TESTED. TRUSTED. <https://redhat.com/trusted> secalert () redhat com for urgent response
Current thread:
- CVE-2021-20177 kernel: iptables string match rule could result in kernel panic Wade Mealing (Jan 11)
- Re: CVE-2021-20177 kernel: iptables string match rule could result in kernel panic Greg KH (Jan 12)
- Re: CVE-2021-20177 kernel: iptables string match rule could result in kernel panic John Haxby (Jan 12)
- Re: CVE-2021-20177 kernel: iptables string match rule could result in kernel panic David A. Wheeler (Jan 12)
- Re: CVE-2021-20177 kernel: iptables string match rule could result in kernel panic Sasha Levin (Jan 12)
- Re: CVE-2021-20177 kernel: iptables string match rule could result in kernel panic Philip Pettersson (Jan 12)
- Re: CVE-2021-20177 kernel: iptables string match rule could result in kernel panic Greg KH (Jan 12)
- Re: CVE-2021-20177 kernel: iptables string match rule could result in kernel panic John Haxby (Jan 12)
- Re: CVE-2021-20177 kernel: iptables string match rule could result in kernel panic Solar Designer (Jan 12)
- Re: CVE-2021-20177 kernel: iptables string match rule could result in kernel panic Greg KH (Jan 12)