Описание
Squid is an open source caching proxy for the Web supporting HTTP, HTTPS, FTP, and more. Due to a Collapse of Data into Unsafe Value bug ,Squid may be vulnerable to a Denial of Service attack against HTTP header parsing. This problem allows a remote client or a remote server to perform Denial of Service when sending oversized headers in HTTP messages. In versions of Squid prior to 6.5 this can be achieved if the request_header_max_size or reply_header_max_size settings are unchanged from the default. In Squid version 6.5 and later, the default setting of these parameters is safe. Squid will emit a critical warning in cache.log if the administrator is setting these parameters to unsafe values. Squid will not at this time prevent these settings from being changed to unsafe values. Users are advised to upgrade to version 6.5. There are no known workarounds for this vulnerability. This issue is also tracked as SQUID-2024:2
A flaw was found in Squid. This issue may allow a remote client or remote server to trigger a denial of service when sending oversized headers in HTTP messages.
Отчет
This issue can be exploitable when the Squid request_header_max_size and reply_header_max_size configuration options have a big value, specifically, values greater than 64KB. In Squid versions prior to 6.5, the default value of these options are unsafe. The Squid package as shipped in Red Hat Enterprise Linux 7, 8 and 9 has an unsafe default configuration and is vulnerable to this issue.
Меры по смягчению последствий
To mitigate this flaw in Squid versions prior to 6.5, set the request_header_max_size and reply_header_max_size configuration options to 21KB. The following lines should be added to the Squid configuration file:
In Squid versions 6.5 and newer, the default values of these options are considered safe and the above configuration can be removed. Also, Squid will emit a warning in the logs if the configured values are unsafe.
Затронутые пакеты
| Платформа | Пакет | Состояние | Рекомендация | Релиз |
|---|---|---|---|---|
| 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 | Fixed | RHSA-2024:1787 | 11.04.2024 |
| Red Hat Enterprise Linux 8 | squid | Fixed | RHSA-2024:1375 | 19.03.2024 |
| Red Hat Enterprise Linux 8.2 Advanced Update Support | squid | Fixed | RHSA-2024:2777 | 09.05.2024 |
| Red Hat Enterprise Linux 8.2 Telecommunications Update Service | squid | Fixed | RHSA-2024:2777 | 09.05.2024 |
| Red Hat Enterprise Linux 8.2 Update Services for SAP Solutions | squid | Fixed | RHSA-2024:2777 | 09.05.2024 |
| Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support | squid | Fixed | RHSA-2024:1832 | 16.04.2024 |
| Red Hat Enterprise Linux 8.4 Telecommunications Update Service | squid | Fixed | RHSA-2024:1832 | 16.04.2024 |
| Red Hat Enterprise Linux 8.4 Update Services for SAP Solutions | squid | Fixed | RHSA-2024:1832 | 16.04.2024 |
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Дополнительная информация
Статус:
8.6 High
CVSS3
Связанные уязвимости
Squid is an open source caching proxy for the Web supporting HTTP, HTTPS, FTP, and more. Due to a Collapse of Data into Unsafe Value bug ,Squid may be vulnerable to a Denial of Service attack against HTTP header parsing. This problem allows a remote client or a remote server to perform Denial of Service when sending oversized headers in HTTP messages. In versions of Squid prior to 6.5 this can be achieved if the request_header_max_size or reply_header_max_size settings are unchanged from the default. In Squid version 6.5 and later, the default setting of these parameters is safe. Squid will emit a critical warning in cache.log if the administrator is setting these parameters to unsafe values. Squid will not at this time prevent these settings from being changed to unsafe values. Users are advised to upgrade to version 6.5. There are no known workarounds for this vulnerability. This issue is also tracked as SQUID-2024:2
Squid is an open source caching proxy for the Web supporting HTTP, HTTPS, FTP, and more. Due to a Collapse of Data into Unsafe Value bug ,Squid may be vulnerable to a Denial of Service attack against HTTP header parsing. This problem allows a remote client or a remote server to perform Denial of Service when sending oversized headers in HTTP messages. In versions of Squid prior to 6.5 this can be achieved if the request_header_max_size or reply_header_max_size settings are unchanged from the default. In Squid version 6.5 and later, the default setting of these parameters is safe. Squid will emit a critical warning in cache.log if the administrator is setting these parameters to unsafe values. Squid will not at this time prevent these settings from being changed to unsafe values. Users are advised to upgrade to version 6.5. There are no known workarounds for this vulnerability. This issue is also tracked as SQUID-2024:2
Squid is an open source caching proxy for the Web supporting HTTP, HTT ...
Уязвимость прокси-сервера Squid, связанная с неконтролируемым потреблением ресурсов, позволяющая нарушителю вызвать отказ в обслуживании
8.6 High
CVSS3