Описание
Libevent is an event notification library. Prior to 2.1.13 and 2.2.2-alpha, the libevent evhttp parser in http.c inconsistently handles duplicate Transfer-Encoding headers, comma-separated Transfer-Encoding values, and bare line feeds in chunked framing. evhttp_find_header can select only the first header, evhttp_check_transfer_encoding_ was absent so the previous whole-string comparison fails to recognize valid lists ending in chunked, and evhttp_handle_chunked_read uses EVBUFFER_EOL_CRLF rather than EVBUFFER_EOL_CRLF_STRICT, accepting bare LF chunk terminators. When libevent is deployed behind a proxy that frames the same request differently, an unauthenticated remote attacker can desynchronize request boundaries and smuggle a second request, potentially bypassing access controls or poisoning caches. This issue is fixed in versions 2.1.13 and 2.2.2-alpha.
| Релиз | Статус | Примечание |
|---|---|---|
| devel | not-affected | 2.1.13-stable-1build1 |
| esm-infra-legacy/trusty | released | 2.0.21-stable-1ubuntu1.14.04.2+esm1 |
| esm-infra-legacy/xenial | released | 2.0.21-stable-2ubuntu0.16.04.1+esm1 |
| esm-infra/bionic | released | 2.1.8-stable-4ubuntu0.1~esm1 |
| esm-infra/focal | released | 2.1.11-stable-1ubuntu0.1~esm1 |
| jammy | released | 2.1.12-stable-1ubuntu0.1 |
| noble | released | 2.1.12-stable-9ubuntu2.1 |
| resolute | released | 2.1.12-stable-10ubuntu0.1 |
| upstream | released | 2.1.13 |
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Связанные уязвимости
Libevent is an event notification library. Prior to 2.1.13 and 2.2.2-alpha, the libevent evhttp parser in http.c inconsistently handles duplicate Transfer-Encoding headers, comma-separated Transfer-Encoding values, and bare line feeds in chunked framing. evhttp_find_header can select only the first header, evhttp_check_transfer_encoding_ was absent so the previous whole-string comparison fails to recognize valid lists ending in chunked, and evhttp_handle_chunked_read uses EVBUFFER_EOL_CRLF rather than EVBUFFER_EOL_CRLF_STRICT, accepting bare LF chunk terminators. When libevent is deployed behind a proxy that frames the same request differently, an unauthenticated remote attacker can desynchronize request boundaries and smuggle a second request, potentially bypassing access controls or poisoning caches. This issue is fixed in versions 2.1.13 and 2.2.2-alpha.
Libevent is an event notification library. Prior to 2.1.13 and 2.2.2-a ...
Уязвимость функции evhttp_find_header() HTTP-парсера evhttp библиотеки асинхронного уведомления событий Libevent, позволяющая нарушителю вызвать отказ в обслуживании
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