CVE-2023-52920— 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bpf模块中，对非r10寄存器进行溢出/填充到堆栈的支持不足，导致精度跟踪逻辑的限制未能有效处理，影响了BPF验证器的性能。
影响版本矩阵 10
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | b5dc0163d8fd78e64a7e21f309cf932fda34353e< ecc2aeeaa08a355d84d3ca9c3d2512399a194f29 |
affected |
b5dc0163d8fd78e64a7e21f309cf932fda34353e< 199f0452873741fa4b8d4d88958e929030b2f92b |
affected | ||
b5dc0163d8fd78e64a7e21f309cf932fda34353e< e4da60feca4d35e1a9b03dc0affa3354f9ff45e4 |
affected | ||
b5dc0163d8fd78e64a7e21f309cf932fda34353e< 41f6f64e6999a837048b1bd13a2f8742964eca6b |
affected | ||
5.3 |
affected | ||
< 5.3 |
unaffected | ||
6.6.64≤ 6.6.* |
unaffected | ||
6.6.70≤ 6.6.* |
unaffected | ||
| … +2 条更多 | |||
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一、 漏洞 CVE-2023-52920 基础信息
漏洞信息
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Vulnerability Title
bpf: support non-r10 register spill/fill to/from stack in precision tracking
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
bpf: support non-r10 register spill/fill to/from stack in precision tracking
Use instruction (jump) history to record instructions that performed
register spill/fill to/from stack, regardless if this was done through
read-only r10 register, or any other register after copying r10 into it
*and* potentially adjusting offset.
To make this work reliably, we push extra per-instruction flags into
instruction history, encoding stack slot index (spi) and stack frame
number in extra 10 bit flags we take away from prev_idx in instruction
history. We don't touch idx field for maximum performance, as it's
checked most frequently during backtracking.
This change removes basically the last remaining practical limitation of
precision backtracking logic in BPF verifier. It fixes known
deficiencies, but also opens up new opportunities to reduce number of
verified states, explored in the subsequent patches.
There are only three differences in selftests' BPF object files
according to veristat, all in the positive direction (less states).
File Program Insns (A) Insns (B) Insns (DIFF) States (A) States (B) States (DIFF)
-------------------------------------- ------------- --------- --------- ------------- ---------- ---------- -------------
test_cls_redirect_dynptr.bpf.linked3.o cls_redirect 2987 2864 -123 (-4.12%) 240 231 -9 (-3.75%)
xdp_synproxy_kern.bpf.linked3.o syncookie_tc 82848 82661 -187 (-0.23%) 5107 5073 -34 (-0.67%)
xdp_synproxy_kern.bpf.linked3.o syncookie_xdp 85116 84964 -152 (-0.18%) 5162 5130 -32 (-0.62%)
Note, I avoided renaming jmp_history to more generic insn_hist to
minimize number of lines changed and potential merge conflicts between
bpf and bpf-next trees.
Notice also cur_hist_entry pointer reset to NULL at the beginning of
instruction verification loop. This pointer avoids the problem of
relying on last jump history entry's insn_idx to determine whether we
already have entry for current instruction or not. It can happen that we
added jump history entry because current instruction is_jmp_point(), but
also we need to add instruction flags for stack access. In this case, we
don't want to entries, so we need to reuse last added entry, if it is
present.
Relying on insn_idx comparison has the same ambiguity problem as the one
that was fixed recently in [0], so we avoid that.
[0] https://patchwork.kernel.org/project/netdevbpf/patch/20231110002638.4168352-3-andrii@kernel.org/
来源: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/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bpf模块中，对非r10寄存器进行溢出/填充到堆栈的支持不足，导致精度跟踪逻辑的限制未能有效处理，影响了BPF验证器的性能。
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-2023-52920 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2023-52920 补丁与修复 (4)
同批安全公告 · Linux · 2024-11-05 · 共 50 条
| CVE-2024-50106 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2024-50113 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-50115 | 8.4 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-50125 | 8.0 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-50124 | 8.0 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-50132 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-50101 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-50090 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-50114 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-50127 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-50126 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-50128 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-50130 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-50091 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-50095 | 7.5 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-50094 | 7.5 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-50131 | 7.3 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-50117 | 7.3 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-50096 | 7.3 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-50099 | 7.3 HIGH | Linux kernel 安全漏洞 |
显示前 20 条，共 50 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2023-52920
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