Описание
Vim is a greatly improved version of the good old UNIX editor Vi. Vim allows to redirect screen messages using the :redir ex command to register, variables and files. It also allows to show the contents of registers using the :registers or :display ex command. When redirecting the output of :display to a register, Vim will free the register content before storing the new content in the register. Now when redirecting the :display command to a register that is being displayed, Vim will free the content while shortly afterwards trying to access it, which leads to a use-after-free. Vim pre 9.1.1115 checks in the ex_display() function, that it does not try to redirect to a register while displaying this register at the same time. However this check is not complete, and so Vim does not check the + and * registers (which typically donate the X11/clipboard registers, and when a clipboard connection is not possible will fall back to use register 0 instead. In Patch 9.1.1115 Vim will therefore skip outputting to register zero when trying to redirect to the clipboard registers * or +. Users are advised to upgrade. There are no known workarounds for this vulnerability.
A flaw was found in Vim's :redir command. This vulnerability allows a use-after-free condition via redirecting the :display command to a clipboard register (* or +), which allows access to freed memory.
Отчет
This flaw is marked as Low Impact because it requires a user to run an untrusted/malicious Vim command. Untrusted Vim scripts should never be run as they can already execute arbitrary shell commands. The security issue raised by this flaw would be no worse than what is already possible when running untrusted Vim scripts.
Меры по смягчению последствий
Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.
Затронутые пакеты
| Платформа | Пакет | Состояние | Рекомендация | Релиз |
|---|---|---|---|---|
| Red Hat Enterprise Linux 10 | vim | Fix deferred | ||
| Red Hat Enterprise Linux 6 | vim | Out of support scope | ||
| Red Hat Enterprise Linux 7 | vim | Out of support scope | ||
| Red Hat Enterprise Linux 8 | vim | Out of support scope | ||
| Red Hat Enterprise Linux 9 | vim | Fix deferred | ||
| Red Hat OpenShift Container Platform 4 | rhcos | Fix deferred |
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Дополнительная информация
Статус:
4.2 Medium
CVSS3
Связанные уязвимости
Vim is a greatly improved version of the good old UNIX editor Vi. Vim allows to redirect screen messages using the `:redir` ex command to register, variables and files. It also allows to show the contents of registers using the `:registers` or `:display` ex command. When redirecting the output of `:display` to a register, Vim will free the register content before storing the new content in the register. Now when redirecting the `:display` command to a register that is being displayed, Vim will free the content while shortly afterwards trying to access it, which leads to a use-after-free. Vim pre 9.1.1115 checks in the ex_display() function, that it does not try to redirect to a register while displaying this register at the same time. However this check is not complete, and so Vim does not check the `+` and `*` registers (which typically donate the X11/clipboard registers, and when a clipboard connection is not possible will fall back to use register 0 instead. In Patch 9.1.1115 Vim...
Vim is a greatly improved version of the good old UNIX editor Vi. Vim allows to redirect screen messages using the `:redir` ex command to register, variables and files. It also allows to show the contents of registers using the `:registers` or `:display` ex command. When redirecting the output of `:display` to a register, Vim will free the register content before storing the new content in the register. Now when redirecting the `:display` command to a register that is being displayed, Vim will free the content while shortly afterwards trying to access it, which leads to a use-after-free. Vim pre 9.1.1115 checks in the ex_display() function, that it does not try to redirect to a register while displaying this register at the same time. However this check is not complete, and so Vim does not check the `+` and `*` registers (which typically donate the X11/clipboard registers, and when a clipboard connection is not possible will fall back to use register 0 instead. In Patch 9.1.1115 Vim wi
Vim is a greatly improved version of the good old UNIX editor Vi. Vim ...
Уязвимость функции ex_display() текстового редактора vim, позволяющая нарушителю выполнить произвольные автокоманды
4.2 Medium
CVSS3