russh: Agent server never calls `Agent::confirm`, so keys added with the confirm constraint (`ssh-add -c`) sign without confirmation

Özet

Türkçe özeti henüz hazır değil; şimdilik kaynağın kendi açıklamasını gösteriyoruz.

russh is a Rust SSH client and server library that includes an SSH agent protocol implementation. From 0.50.0-beta.12 until 0.65.0, the agent server's Connection::try_sign path in russh/src/keys/agent/server.rs recognizes SSH_AGENT_CONSTRAIN_CONFIRM but returns a hard-coded successful result instead of calling Agent::confirm. In applications that override Agent::confirm to require user approval or another policy check, a process that can reach the agent socket, including the remote side of a forwarded agent, can use a key added through ssh-add -c without that check and can authenticate or sign data as the user while the key remains loaded. The separate Agent::confirm_request hook still runs for every signing request, so checks implemented there remain effective, and implementations that retain the default always-successful Agent::confirm do not lose an approval check through this regression. This issue is fixed in version 0.65.0.

Etkilenen sürümler1 yazılım

Kaynaklar6 kaynak

• CVE.org kaydı
• NVD kaydı
• github.com/…/russh/security/advisories/GHSA-vp5q-ff62-jwqv Diğer
• github.com/…ommit/3e04597dc54e36bfc85c21996f7d8d9d224e9826 Diğer
• github.com/…ommit/62db6e7defd6d244159da962ccccb029e785ce0f Diğer
• github.com/Eugeny/russh/releases/tag/v0.65.0 Diğer

Kayıt geçmişi

1. 28 Eki 2026 20:06Yayımlandı

İlgili açıklar

• 2,3 CVE-2026-116775pageant: uzak sunucu kontrollü uzunluk alanı ile sınırsız bellek tüketimi (DoS)
• 4,3 CVE-2026-116774russh (Rust SSH kütüphanesi): sıfır maksimum paket boyutu kanal yazmalarını kalıcı olarak askıya alıyor
• 4,3 CVE-2026-116773russh SSH istemcisinde EXT_INFO paketleri ile sınırsız bellek ayırma
• 3,3 CVE-2026-116696russh SSH agent sunucusunda sınırsız bellek ayırma (SSH_AGENT_CONSTRAIN_CONFIRM)
• 6,5 CVE-2026-105620PostgreSQL Anonymizer: A masked role reads the authentic data of masked tables through a masking rule with a sub-query
• 5,7 CVE-2026-105618PostgreSQL Anonymizer: Masked partitions and child tables are not masked when they are queried through their parent