Описание
An issue was discovered in Squid before 4.9. URN response handling in Squid suffers from a heap-based buffer overflow. When receiving data from a remote server in response to an URN request, Squid fails to ensure that the response can fit within the buffer. This leads to attacker controlled data overflowing in the heap.
A heap-based buffer overflow was found in the way squid processed certain Uniform Resource Names (URNs). A remote attacker could use this flaw to cause Squid to crash or execute arbitrary code with the permissions of the user running Squid.
Отчет
This is a heap-based buffer overflow, which can be triggered by a malicious client. The client can overwrite substantial amount of heap potentially causing squid to crash or even execute arbitrary code with the permissions of the user running squid (normally squid user which is non-privileged). Also on Red Hat Products, squid is confined with selinux which should reduce the possibilities of code execution. Because of the above mentioned difficulties in exploitation, Red Hat Product Security has classified this flaw as having Moderate impact.
Меры по смягчению последствий
The following mitigation is suggested by upstream: Deny urn: protocol URI being proxied to all clients:
Затронутые пакеты
| Платформа | Пакет | Состояние | Рекомендация | Релиз |
|---|---|---|---|---|
| Red Hat Enterprise Linux 5 | squid | Not affected | ||
| Red Hat Enterprise Linux 6 | squid | Out of support scope | ||
| Red Hat Enterprise Linux 6 | squid34 | Out of support scope | ||
| Red Hat Enterprise Linux 7 | squid | Will not fix | ||
| Red Hat Enterprise Linux 8 | squid | Fixed | RHSA-2020:4743 | 04.11.2020 |
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Дополнительная информация
Статус:
EPSS
8.1 High
CVSS3
Связанные уязвимости
An issue was discovered in Squid before 4.9. URN response handling in Squid suffers from a heap-based buffer overflow. When receiving data from a remote server in response to an URN request, Squid fails to ensure that the response can fit within the buffer. This leads to attacker controlled data overflowing in the heap.
An issue was discovered in Squid before 4.9. URN response handling in Squid suffers from a heap-based buffer overflow. When receiving data from a remote server in response to an URN request, Squid fails to ensure that the response can fit within the buffer. This leads to attacker controlled data overflowing in the heap.
An issue was discovered in Squid before 4.9. URN response handling in ...
An issue was discovered in Squid before 4.9. URN response handling in Squid suffers from a heap-based buffer overflow. When receiving data from a remote server in response to an URN request, Squid fails to ensure that the response can fit within the buffer. This leads to attacker controlled data overflowing in the heap.
Уязвимость механизма обработки URN-ответов прокси-сервера Squid, связанная с недостатком механизма проверки размера копируемых данных, позволяющая нарушителю получить доступ к конфиденциальным данным, нарушить их целостность, а также вызвать отказ в обслуживании
EPSS
8.1 High
CVSS3