CVE-2024-45025— 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close_range组件存在位图损坏问题。
可能的 ATT&CK 技术 1 AI
T1003 · OS Credential Dumping影响版本矩阵 14
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | 278a5fbaed89dacd04e9d052f4594ffd0e0585de< fe5bf14881701119aeeda7cf685f3c226c7380df |
affected |
278a5fbaed89dacd04e9d052f4594ffd0e0585de< 5053581fe5dfb09b58c65dd8462bf5dea71f41ff |
affected | ||
278a5fbaed89dacd04e9d052f4594ffd0e0585de< 8cad3b2b3ab81ca55f37405ffd1315bcc2948058 |
affected | ||
278a5fbaed89dacd04e9d052f4594ffd0e0585de< dd72ae8b0fce9c0bbe9582b9b50820f0407f8d8a |
affected | ||
278a5fbaed89dacd04e9d052f4594ffd0e0585de< c69d18f0ac7060de724511537810f10f29a27958 |
affected | ||
278a5fbaed89dacd04e9d052f4594ffd0e0585de< 9a2fa1472083580b6c66bdaf291f591e1170123a |
affected | ||
5.9 |
affected | ||
< 5.9 |
unaffected | ||
| … +6 条更多 | |||
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一、 漏洞 CVE-2024-45025 基础信息
漏洞信息
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Vulnerability Title
fix bitmap corruption on close_range() with CLOSE_RANGE_UNSHARE
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
fix bitmap corruption on close_range() with CLOSE_RANGE_UNSHARE
copy_fd_bitmaps(new, old, count) is expected to copy the first
count/BITS_PER_LONG bits from old->full_fds_bits[] and fill
the rest with zeroes. What it does is copying enough words
(BITS_TO_LONGS(count/BITS_PER_LONG)), then memsets the rest.
That works fine, *if* all bits past the cutoff point are
clear. Otherwise we are risking garbage from the last word
we'd copied.
For most of the callers that is true - expand_fdtable() has
count equal to old->max_fds, so there's no open descriptors
past count, let alone fully occupied words in ->open_fds[],
which is what bits in ->full_fds_bits[] correspond to.
The other caller (dup_fd()) passes sane_fdtable_size(old_fdt, max_fds),
which is the smallest multiple of BITS_PER_LONG that covers all
opened descriptors below max_fds. In the common case (copying on
fork()) max_fds is ~0U, so all opened descriptors will be below
it and we are fine, by the same reasons why the call in expand_fdtable()
is safe.
Unfortunately, there is a case where max_fds is less than that
and where we might, indeed, end up with junk in ->full_fds_bits[] -
close_range(from, to, CLOSE_RANGE_UNSHARE) with
* descriptor table being currently shared
* 'to' being above the current capacity of descriptor table
* 'from' being just under some chunk of opened descriptors.
In that case we end up with observably wrong behaviour - e.g. spawn
a child with CLONE_FILES, get all descriptors in range 0..127 open,
then close_range(64, ~0U, CLOSE_RANGE_UNSHARE) and watch dup(0) ending
up with descriptor #128, despite #64 being observably not open.
The minimally invasive fix would be to deal with that in dup_fd().
If this proves to add measurable overhead, we can go that way, but
let's try to fix copy_fd_bitmaps() first.
* new helper: bitmap_copy_and_expand(to, from, bits_to_copy, size).
* make copy_fd_bitmaps() take the bitmap size in words, rather than
bits; it's 'count' argument is always a multiple of BITS_PER_LONG,
so we are not losing any information, and that way we can use the
same helper for all three bitmaps - compiler will see that count
is a multiple of BITS_PER_LONG for the large ones, so it'll generate
plain memcpy()+memset().
Reproducer added to tools/testing/selftests/core/close_range_test.c
来源: CVE Program / CVE List V5
CVSS Information
N/A
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close_range组件存在位图损坏问题。
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-2024-45025 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2024-45025 补丁与修复 (8)
同批安全公告 · Linux · 2024-09-11 · 共 23 条
| CVE-2024-45030 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2024-45013 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2024-45009 | 8.2 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-45019 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-45016 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-45017 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-45020 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-45023 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-45022 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-45024 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-45021 | 7.1 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-45026 | 7.0 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-46672 | Linux kernel 安全漏洞 | |
| CVE-2024-45018 | Linux kernel 安全漏洞 | |
| CVE-2024-45027 | Linux kernel 安全漏洞 | |
| CVE-2024-45014 | Linux kernel 安全漏洞 | |
| CVE-2024-45015 | Linux kernel 安全漏洞 | |
| CVE-2024-45012 | Linux kernel 安全漏洞 | |
| CVE-2024-45029 | Linux kernel 安全漏洞 | |
| CVE-2024-45011 | Linux kernel 安全漏洞 |
显示前 20 条，共 23 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2024-45025
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