CVE-2026-25961
HighSummary
SumatraPDF to czytnik wielu formatów dla systemu Windows. W wersjach od 3.5.0 do 3.5.2 mechanizm aktualizacji SumatraPDF wyłącza weryfikację nazwy hosta TLS oraz wykonuje instalatory bez sprawdzania podpisów, co umożliwia atakującym z sieci przechwycenie żądania aktualizacji i wstrzyknięcie złośliwego adresu URL instalatora.
Risk Assessment
Atakujący posiadający ważny certyfikat TLS może przejąć kontrolę nad procesem aktualizacji, co prowadzi do potencjalnego wykonania dowolnego kodu na zainfekowanym systemie. To stwarza poważne zagrożenie dla bezpieczeństwa organizacji.
Recommendation
Zaleca się aktualizację SumatraPDF do najnowszej wersji, która naprawia ten problem oraz włączenie dodatkowych mechanizmów zabezpieczeń, takich jak monitorowanie ruchu sieciowego i stosowanie zapór ogniowych.
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Original NVD description (English source)
SumatraPDF is a multi-format reader for Windows. In 3.5.0 through 3.5.2, SumatraPDF's update mechanism disables TLS hostname verification (INTERNET_FLAG_IGNORE_CERT_CN_INVALID) and executes installers without signature checks. A network attacker with any valid TLS certificate (e.g., Let's Encrypt) can intercept the update check request, inject a malicious installer URL, and achieve arbitrary code execution.