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CVE PROGRAM SOURCE RECORDUnscored

CVE-2024-50038

netfilter: xtables: avoid NFPROTO_UNSPEC where needed

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Status
Published
Published
Updated
Assigning organization
Linux

Description

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • 0269ea4937343536ec7e85649932bc8c9686ea78 to < 85ff9a0f793ca52c527e75cd40a69c948627ebdeaffected
  • 0269ea4937343536ec7e85649932bc8c9686ea78 to < 8f482bb7e27b37f1f734bb9a8eeb28b23d59d189affected
  • 0269ea4937343536ec7e85649932bc8c9686ea78 to < 997f67d813ce0cf5eb3cdb8f124da68141e91b6caffected
  • 0269ea4937343536ec7e85649932bc8c9686ea78 to < 4cdc55ec6222bb195995cc58f7cb46e4d8907056affected
  • 0269ea4937343536ec7e85649932bc8c9686ea78 to < 0bfcb7b71e735560077a42847f69597ec7dcc326affected

Linux Linux

Default version status: affected

  • 2.6.30affected
  • 0 to < 2.6.30unaffected
  • 5.15.168 to ≤ 5.15.*unaffected
  • 6.1.113 to ≤ 6.1.*unaffected
  • 6.6.57 to ≤ 6.6.*unaffected
  • 6.11.4 to ≤ 6.11.*unaffected
  • 6.12 to ≤ *unaffected

References