CVE-2024-27415 (GCVE-0-2024-27415)

Vulnerability from cvelistv5 – Published: 2024-05-17 11:51 – Updated: 2025-05-04 09:04
VLAI?
Title
netfilter: bridge: confirm multicast packets before passing them up the stack
Summary
In the Linux kernel, the following vulnerability has been resolved: netfilter: bridge: confirm multicast packets before passing them up the stack conntrack nf_confirm logic cannot handle cloned skbs referencing the same nf_conn entry, which will happen for multicast (broadcast) frames on bridges. Example: macvlan0 | br0 / \ ethX ethY ethX (or Y) receives a L2 multicast or broadcast packet containing an IP packet, flow is not yet in conntrack table. 1. skb passes through bridge and fake-ip (br_netfilter)Prerouting. -> skb->_nfct now references a unconfirmed entry 2. skb is broad/mcast packet. bridge now passes clones out on each bridge interface. 3. skb gets passed up the stack. 4. In macvlan case, macvlan driver retains clone(s) of the mcast skb and schedules a work queue to send them out on the lower devices. The clone skb->_nfct is not a copy, it is the same entry as the original skb. The macvlan rx handler then returns RX_HANDLER_PASS. 5. Normal conntrack hooks (in NF_INET_LOCAL_IN) confirm the orig skb. The Macvlan broadcast worker and normal confirm path will race. This race will not happen if step 2 already confirmed a clone. In that case later steps perform skb_clone() with skb->_nfct already confirmed (in hash table). This works fine. But such confirmation won't happen when eb/ip/nftables rules dropped the packets before they reached the nf_confirm step in postrouting. Pablo points out that nf_conntrack_bridge doesn't allow use of stateful nat, so we can safely discard the nf_conn entry and let inet call conntrack again. This doesn't work for bridge netfilter: skb could have a nat transformation. Also bridge nf prevents re-invocation of inet prerouting via 'sabotage_in' hook. Work around this problem by explicit confirmation of the entry at LOCAL_IN time, before upper layer has a chance to clone the unconfirmed entry. The downside is that this disables NAT and conntrack helpers. Alternative fix would be to add locking to all code parts that deal with unconfirmed packets, but even if that could be done in a sane way this opens up other problems, for example: -m physdev --physdev-out eth0 -j SNAT --snat-to 1.2.3.4 -m physdev --physdev-out eth1 -j SNAT --snat-to 1.2.3.5 For multicast case, only one of such conflicting mappings will be created, conntrack only handles 1:1 NAT mappings. Users should set create a setup that explicitly marks such traffic NOTRACK (conntrack bypass) to avoid this, but we cannot auto-bypass them, ruleset might have accept rules for untracked traffic already, so user-visible behaviour would change.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 7c3f28599652acf431a2211168de4a583f30b6d5 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 2b1414d5e94e477edff1d2c79030f1d742625ea0 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 80cd0487f630b5382734997c3e5e3003a77db315 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < cb734975b0ffa688ff6cc0eed463865bf07b6c01 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 62e7151ae3eb465e0ab52a20c941ff33bb6332e9 (git)
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    Linux Linux Affected: 2.6.12
Unaffected: 0 , < 2.6.12 (semver)
Unaffected: 5.15.151 , ≤ 5.15.* (semver)
Unaffected: 6.1.81 , ≤ 6.1.* (semver)
Unaffected: 6.6.21 , ≤ 6.6.* (semver)
Unaffected: 6.7.9 , ≤ 6.7.* (semver)
Unaffected: 6.8 , ≤ * (original_commit_for_fix)
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This works fine.\\n\\nBut such confirmation won\u0027t happen when eb/ip/nftables rules dropped the\\npackets before they reached the nf_confirm step in postrouting.\\n\\nPablo points out that nf_conntrack_bridge doesn\u0027t allow use of stateful\\nnat, so we can safely discard the nf_conn entry and let inet call\\nconntrack again.\\n\\nThis doesn\u0027t work for bridge netfilter: skb could have a nat\\ntransformation. Also bridge nf prevents re-invocation of inet prerouting\\nvia \u0027sabotage_in\u0027 hook.\\n\\nWork around this problem by explicit confirmation of the entry at LOCAL_IN\\ntime, before upper layer has a chance to clone the unconfirmed entry.\\n\\nThe downside is that this disables NAT and conntrack helpers.\\n\\nAlternative fix would be to add locking to all code parts that deal with\\nunconfirmed packets, but even if that could be done in a sane way this\\nopens up other problems, for example:\\n\\n-m physdev --physdev-out eth0 -j SNAT --snat-to 1.2.3.4\\n-m physdev --physdev-out eth1 -j SNAT --snat-to 1.2.3.5\\n\\nFor multicast case, only one of such conflicting mappings will be\\ncreated, conntrack only handles 1:1 NAT mappings.\\n\\nUsers should set create a setup that explicitly marks such traffic\\nNOTRACK (conntrack bypass) to avoid this, but we cannot auto-bypass\\nthem, ruleset might have accept rules for untracked traffic already,\\nso user-visible behaviour would change.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.151\", \"versionStartIncluding\": \"2.6.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.81\", \"versionStartIncluding\": \"2.6.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.21\", \"versionStartIncluding\": \"2.6.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.7.9\", \"versionStartIncluding\": \"2.6.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.8\", \"versionStartIncluding\": \"2.6.12\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-05-04T09:04:39.496Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-27415\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-05-04T09:04:39.496Z\", \"dateReserved\": \"2024-02-25T13:47:42.682Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-05-17T11:51:00.711Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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Sightings

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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.