CVE-2024-50038: netfilter: xtables: avoid NFPROTO_UNSPEC where needed
First published: Mon Oct 21 2024(Updated: )
In the Linux kernel, the following vulnerability has been resolved: netfilter: xtables: avoid NFPROTO_UNSPEC where needed syzbot managed to call xt_cluster match via ebtables: WARNING: CPU: 0 PID: 11 at net/netfilter/xt_cluster.c:72 xt_cluster_mt+0x196/0x780 [..] ebt_do_table+0x174b/0x2a40 Module registers to NFPROTO_UNSPEC, but it assumes ipv4/ipv6 packet processing. As this is only useful to restrict locally terminating TCP/UDP traffic, register this for ipv4 and ipv6 family only. Pablo points out that this is a general issue, direct users of the set/getsockopt interface can call into targets/matches that were only intended for use with ip(6)tables. Check all UNSPEC matches and targets for similar issues: - matches and targets are fine except if they assume skb_network_header() is valid -- this is only true when called from inet layer: ip(6) stack pulls the ip/ipv6 header into linear data area. - targets that return XT_CONTINUE or other xtables verdicts must be restricted too, they are incompatbile with the ebtables traverser, e.g. EBT_CONTINUE is a completely different value than XT_CONTINUE. Most matches/targets are changed to register for NFPROTO_IPV4/IPV6, as they are provided for use by ip(6)tables. The MARK target is also used by arptables, so register for NFPROTO_ARP too. While at it, bail out if connbytes fails to enable the corresponding conntrack family. This change passes the selftests in iptables.git.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Linux kernel | >=2.6.30<5.15.168 | |
| Linux Linux kernel | >=5.16<6.1.113 | |
| Linux Linux kernel | >=6.2<6.6.57 | |
| Linux Linux kernel | >=6.7<6.11.4 | |
| Linux Linux kernel | =6.12-rc1 | |
| Linux Linux kernel | =6.12-rc2 | |
| debian/linux | <=5.10.223-1<=5.10.226-1 | 6.1.115-1 6.1.119-1 6.12.5-1 6.12.6-1 |
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Reference Links
- https://git.kernel.org/stable/c/0bfcb7b71e735560077a42847f69597ec7dcc326
- https://git.kernel.org/stable/c/4cdc55ec6222bb195995cc58f7cb46e4d8907056
- https://git.kernel.org/stable/c/85ff9a0f793ca52c527e75cd40a69c948627ebde
- https://git.kernel.org/stable/c/8f482bb7e27b37f1f734bb9a8eeb28b23d59d189
- https://git.kernel.org/stable/c/997f67d813ce0cf5eb3cdb8f124da68141e91b6c
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-50038
- https://nvd.nist.gov/vuln/detail/CVE-2024-50038
- https://launchpad.net/bugs/cve/CVE-2024-50038
- https://security-tracker.debian.org/tracker/CVE-2024-50038
- https://ubuntu.com/security/CVE-2024-50038
- https://git.kernel.org/linus/0bfcb7b71e735560077a42847f69597ec7dcc326
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