Описание
[REJECTED CVE] An issue was identified in the Linux kernel's netfilter subsystem related to nf_tables. The issue occurs when a positive value, such as NF_ACCEPT, is provided in the upper 16 bits of NF_DROP verdict parameters, which are expected to contain valid errno values (e.g., -EPERM). This improper input handling could lead to memory corruption, potentially allowing attackers to exploit the system.
Отчет
This CVE has been rejected upstream:- https://lore.kernel.org/linux-cve-announce/20240312135714.1522772-2-lee@kernel.org/
Затронутые пакеты
| Платформа | Пакет | Состояние | Рекомендация | Релиз |
|---|---|---|---|---|
| Red Hat Enterprise Linux 6 | kernel | Not affected | ||
| Red Hat Enterprise Linux 7 | kernel | Out of support scope | ||
| Red Hat Enterprise Linux 7 | kernel-rt | Out of support scope | ||
| Red Hat Enterprise Linux 9 | kernel-rt | Affected | ||
| Red Hat Enterprise Linux 8 | kernel-rt | Fixed | RHSA-2024:2950 | 22.05.2024 |
| Red Hat Enterprise Linux 8 | kernel | Fixed | RHSA-2024:3138 | 22.05.2024 |
| Red Hat Enterprise Linux 9 | kernel | Fixed | RHSA-2024:2394 | 30.04.2024 |
| Red Hat Enterprise Linux 9 | kernel | Fixed | RHSA-2024:2394 | 30.04.2024 |
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Дополнительная информация
Статус:
5.5 Medium
CVSS3
Связанные уязвимости
Rejected reason: This CVE ID has been rejected or withdrawn by its CVE Numbering Authority.
In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_tables: reject QUEUE/DROP verdict parameters This reverts commit e0abdadcc6e1. core.c:nf_hook_slow assumes that the upper 16 bits of NF_DROP verdicts contain a valid errno, i.e. -EPERM, -EHOSTUNREACH or similar, or 0. Due to the reverted commit, its possible to provide a positive value, e.g. NF_ACCEPT (1), which results in use-after-free. Its not clear to me why this commit was made. NF_QUEUE is not used by nftables; "queue" rules in nftables will result in use of "nft_queue" expression. If we later need to allow specifiying errno values from userspace (do not know why), this has to call NF_DROP_GETERR and check that "err <= 0" holds true.
Уязвимость компоненты netfilter ядра операционной системы Linux в функции nft_verdict_init(), позволяющая нарушителю оказать воздействие на конфиденциальность, целостность и доступность защищаемой информации
ELSA-2024-3138: kernel security, bug fix, and enhancement update (MODERATE)
5.5 Medium
CVSS3