FreeSWITCH: Pre-authentication out-of-bounds writes in mod_xml_rpc WebSocket frame parsing

Özet

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FreeSWITCH is a Software Defined Telecom Stack enabling the digital transformation from proprietary telecom switches to a software implementation that runs on any commodity hardware. Prior to 1.11.2, ws_read_frame() unmasked a WebSocket payload by iterating wsh->datalen, which included frame headers, while indexing from the payload pointer. A masked frame filling the 64 KiB receive buffer could therefore XOR up to 14 bytes beyond the buffer, and the exact-capacity case also wrote a terminating NUL one byte out of bounds. The flaw is reachable before authentication when mod_xml_rpc and its opt-in WebSocket endpoint are enabled, while both features are disabled in the stock configuration. The writes remain within the same connection handle's adjacent outbound buffer, so neither a process crash nor cross-session disclosure has been demonstrated. This issue is fixed in version 1.11.2.

Etkilenen sürümler1 yazılım

Kaynaklar5 kaynak

• CVE.org kaydı
• NVD kaydı
• github.com/…switch/security/advisories/GHSA-4cg6-rvh2-cw74 Diğer
• github.com/…ommit/fb9f37b9c7869630ee52a3ae87399fbbf99ad74d Diğer
• github.com/signalwire/freeswitch/releases/tag/v1.11.2 Diğer

Kayıt geçmişi

1. 5 Kas 2026 22:28Yayımlandı

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