CVE-2022-31017

Zulip is an open-source team collaboration tool. Versions 2.1.0 through and including 5.2 are vulnerable to a logic error. A stream configured as private with protected history, where new subscribers should not be allowed to see messages sent before they were subscribed, when edited causes the server to incorrectly send an API event that includes the edited message to all of the stream’s current subscribers. This API event is ignored by official clients, but can be observed by using a modified client or the browser’s developer tools. This bug will be fixed in Zulip Server 5.3. There are no known workarounds.

Zulip is an open-source team collaboration tool. Versions 2.1.0 through and including 5.2 are vulnerable to a logic error. A stream configured as private with protected history, where new subscribers should not be allowed to see messages sent before they were subscribed, when edited causes the server to incorrectly send an API event that includes the edited message to all of the stream’s current subscribers. This API event is ignored by official clients, but can be observed by using a modified client or the browser’s developer tools. This bug will be fixed in Zulip Server 5.3. There are no known workarounds.

Zulip es una herramienta de colaboración en equipo de código abierto. Las versiones 2.1.0 hasta 5.2 incluyéndola, son vulnerables a un error lógico. Un flujo configurado como privado con historial protegido, en el que los nuevos suscriptores no deberían poder visualizar los mensajes enviados antes de estar suscritos, cuando es editado causa que el servidor envíe incorrectamente un evento de la API que incluye el mensaje editado a todos los suscriptores actuales del flujo. Este evento de la API es ignorado por los clientes oficiales, pero puede ser observado al usar un cliente modificado o las herramientas de desarrollo del navegador. Este bug será corregido en Zulip Server versión 5.3. No se presentan mitigaciones conocidas