CVE-2024-27415— Linux kernel 安全漏洞
一分钟漏洞结论
影响对象
Linux Linux
利用判断
尚无明确在野利用证据，仍需结合暴露面评估
建议动作
优先检查厂商安全公告和参考链接中的修复版本；无法立即升级时，限制受影响服务暴露并加强监测。
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于conntrack nf_confirm 逻辑无法处理引用相同 nf_conn 条目的克隆 skb，这将发生在网桥上的多播（广播）帧上。
影响版本矩阵 12
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 7c3f28599652acf431a2211168de4a583f30b6d5 |
affected |
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 2b1414d5e94e477edff1d2c79030f1d742625ea0 |
affected | ||
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 80cd0487f630b5382734997c3e5e3003a77db315 |
affected | ||
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< cb734975b0ffa688ff6cc0eed463865bf07b6c01 |
affected | ||
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 62e7151ae3eb465e0ab52a20c941ff33bb6332e9 |
affected | ||
2.6.12 |
affected | ||
< 2.6.12 |
unaffected | ||
5.15.151≤ 5.15.* |
unaffected | ||
| … +4 条更多 | |||
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一、 漏洞 CVE-2024-27415 基础信息
漏洞信息
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Vulnerability Title
netfilter: bridge: confirm multicast packets before passing them up the stack
来源: CVE Program / CVE List V5
Vulnerability Description
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.
来源: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
来源: CVE Program / CVE List V5
Vulnerability Type
N/A
来源: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于conntrack nf_confirm 逻辑无法处理引用相同 nf_conn 条目的克隆 skb，这将发生在网桥上的多播（广播）帧上。
来源: 中国国家信息安全漏洞库 CNNVD
CVSS Information
N/A
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Type
N/A
来源: 中国国家信息安全漏洞库 CNNVD
受影响产品
二、漏洞 CVE-2024-27415 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2024-27415 其他参考 (5)
同批安全公告 · Linux · 2024-05-17 · 共 135 条
| CVE-2023-52687 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2024-35856 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-35804 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-35843 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-35811 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-27416 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-27404 | 8.2 HIGH | Linux kernel 安全漏洞 |
| CVE-2023-52669 | 8.2 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-35834 | 8.2 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-35789 | 8.0 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-35830 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-35793 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-35827 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2023-52662 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-35817 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-35808 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-27403 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-35798 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-35814 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-35810 | 7.8 HIGH | Linux kernel 安全漏洞 |
显示前 20 条，共 135 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2024-27415
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