Описание
An issue was discovered in libX11 through 1.6.5. The function XListExtensions in ListExt.c interprets a variable as signed instead of unsigned, resulting in an out-of-bounds write (of up to 128 bytes), leading to DoS or remote code execution.
An out of bounds write, limited to NULL bytes, was discovered in libX11 in functions XListExtensions() and XGetFontPath(). The length field is considered as a signed value, which makes the library access memory before the intended buffer. An attacker who can either configure a malicious X server or modify the data coming from one could use this flaw to make the program crash or have other unspecified effects, caused by the memory corruption.
Отчет
To exploit the vulnerability an attacker would need to have already compromised the X server used by your applications. Normally, the X client that runs libX11 and the X server runs on the same machine, thus if an attacker can trigger this flaw he has already compromised the X server, which runs as root, and he has already full control on the system. If the X client runs on another system than the X server (e.g. DISPLAY environment variable is used and it points to an X server on another system) then exploiting this vulnerability would only gain the privileges of the client, which should not be run with high privileges. For the above reasons, this flaw was rated as Moderate Impact.
Затронутые пакеты
| Платформа | Пакет | Состояние | Рекомендация | Релиз |
|---|---|---|---|---|
| Red Hat Enterprise Linux 5 | libX11 | Will not fix | ||
| Red Hat Enterprise Linux 6 | libX11 | Will not fix | ||
| Red Hat Enterprise Linux 8 | libX11 | Not affected | ||
| Red Hat Enterprise Linux 7 | gdm | Fixed | RHSA-2019:2079 | 06.08.2019 |
| Red Hat Enterprise Linux 7 | libX11 | Fixed | RHSA-2019:2079 | 06.08.2019 |
| Red Hat Enterprise Linux 7 | libxkbcommon | Fixed | RHSA-2019:2079 | 06.08.2019 |
| Red Hat Enterprise Linux 7 | mesa-libGLw | Fixed | RHSA-2019:2079 | 06.08.2019 |
| Red Hat Enterprise Linux 7 | xorg-x11-drv-ati | Fixed | RHSA-2019:2079 | 06.08.2019 |
| Red Hat Enterprise Linux 7 | xorg-x11-drv-vesa | Fixed | RHSA-2019:2079 | 06.08.2019 |
| Red Hat Enterprise Linux 7 | xorg-x11-drv-wacom | Fixed | RHSA-2019:2079 | 06.08.2019 |
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Дополнительная информация
Статус:
EPSS
8.1 High
CVSS3
Связанные уязвимости
An issue was discovered in libX11 through 1.6.5. The function XListExtensions in ListExt.c interprets a variable as signed instead of unsigned, resulting in an out-of-bounds write (of up to 128 bytes), leading to DoS or remote code execution.
An issue was discovered in libX11 through 1.6.5. The function XListExtensions in ListExt.c interprets a variable as signed instead of unsigned, resulting in an out-of-bounds write (of up to 128 bytes), leading to DoS or remote code execution.
An issue was discovered in libX11 through 1.6.5. The function XListExt ...
An issue was discovered in libX11 through 1.6.5. The function XListExtensions in ListExt.c interprets a variable as signed instead of unsigned, resulting in an out-of-bounds write (of up to 128 bytes), leading to DoS or remote code execution.
Уязвимость функциях XListExtensions библиотеки предоставления клиентского API для X Window System libX11, позволяющая нарушителю вызвать отказ в обслуживании или выполнить произвольный код
EPSS
8.1 High
CVSS3