CVE-2026-68553— Coturn 格式化字符串错误漏洞

Coturn: Format String Injection via TURN USERNAME/REALM into hiredis Redis Command

Coturn is a free open source implementation of TURN and STUN Server. Prior to 4.13.0, an authenticated TURN user can place printf-style format specifiers in the STUN USERNAME or REALM attribute, which passes is_secure_string() validation and is embedded into Redis keys at nine call sites in src/apps/relay/ns_ioalib_engine_impl.c. send_message_to_redis() in src/apps/relay/hiredis_libevent2.c then passes the attacker-controlled key as the format argument to redisAsyncCommand() while supplying only one variadic value, causing hiredis redisvFormatCommand() to read past the va_list. Exploitation can crash the coturn process and terminate active TURN sessions or disclose stack memory into Redis. This issue is fixed in version 4.13.0.

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:H

使用外部控制的格式字符串

Coturn 格式化字符串错误漏洞

Coturn是Coturn组织开源的一款实现TURN协议的服务器软件。 Coturn 4.13.0之前版本存在格式化字符串错误漏洞，该漏洞源于STUN USERNAME或REALM属性中存在printf样式格式说明符，可能导致进程崩溃、终止活动TURN会话或将堆栈内存泄露到Redis。

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