Описание
A vulnerability in NGINX's ngx_http_ssi_module allows an unauthenticated MITM attacker to trigger a heap buffer over-read by manipulating upstream server responses. This requires SSI, proxy_pass, and proxy_buffering off to be configured, and can result in memory modification or a Denial of Service (DoS).
Отчет
This Moderate severity vulnerability in NGINX affects configurations utilizing the ngx_http_ssi_module alongside proxy_pass and proxy_buffering off. Exploitation requires an unauthenticated man-in-the-middle attacker to control upstream server responses, leading to limited memory modification or a worker process restart. The specific combination of directives and an active MITM position limits the overall impact.
Меры по смягчению последствий
To prevent exploitation, avoid configuring NGINX with ngx_http_ssi_module when proxy_pass and proxy_buffering off are simultaneously active. If Server-Side Includes (SSI) are not essential, disable the ngx_http_ssi_module by removing or commenting out the ssi on; directive. Alternatively, ensure proxy_buffering is explicitly enabled (proxy_buffering on;) when proxy_pass is used with SSI. A reload or restart of the NGINX service is necessary for configuration changes to apply, which may cause a brief service interruption.
Затронутые пакеты
| Платформа | Пакет | Состояние | Рекомендация | Релиз |
|---|---|---|---|---|
| Red Hat Enterprise Linux 10 | nginx | Fix deferred | ||
| Red Hat Enterprise Linux 8 | nginx:1.24/nginx | Fix deferred | ||
| Red Hat Enterprise Linux 9 | nginx | Fix deferred | ||
| Red Hat Enterprise Linux 9 | nginx:1.24/nginx | Fix deferred | ||
| Red Hat Enterprise Linux 9 | nginx:1.26/nginx | Fix deferred | ||
| Red Hat Hardened Images | nginx | Affected | ||
| Red Hat Hardened Images | php | Not affected | ||
| Red Hat Lightspeed proxy 1 | insights-proxy/insights-proxy-container-rhel9 | Fix deferred |
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Дополнительная информация
Статус:
EPSS
6.5 Medium
CVSS3
Связанные уязвимости
NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_ssi_module module. This vulnerability may exist when the Server-Side Includes (SSI), proxy_pass, and proxy_buffering off directives are configured. With this configuration, an unauthenticated attacker with man-in-the-middle (MITM) ability to control responses from an upstream server may be able to cause a use-after-free in the NGINX worker process. This issue may lead to limited modification of memory or a restart of the NGINX worker process. Impact: This vulnerability may allow remote attackers to have limited control to modify memory contents or restart the NGINX worker process. There is no control plane exposure; this is a data plane issue only. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.
NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_ssi_module module. This vulnerability may exist when the Server-Side Includes (SSI), proxy_pass, and proxy_buffering off directives are configured. With this configuration, an unauthenticated attacker with man-in-the-middle (MITM) ability to control responses from an upstream server may be able to cause a use-after-free in the NGINX worker process. This issue may lead to limited modification of memory or a restart of the NGINX worker process. Impact: This vulnerability may allow remote attackers to have limited control to modify memory contents or restart the NGINX worker process. There is no control plane exposure; this is a data plane issue only. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.
NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_ ...
NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_ssi_module module. This vulnerability may exist when the Server-Side Includes (SSI), proxy_pass, and proxy_buffering off directives are configured. With this configuration, an unauthenticated attacker with man-in-the-middle (MITM) ability to control responses from an upstream server may be able to cause a heap buffer over-read in the NGINX worker process. This issue may lead to limited modification of memory or a restart of the NGINX worker process. Impact: This vulnerability may allow remote attackers to have limited control to modify memory contents or restart the NGINX worker process. There is no control plane exposure; this is a data plane issue only. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.
EPSS
6.5 Medium
CVSS3