جزئیات آسیب‌پذیری

GoSign Desktop versions 2.4.0 and earlier use an unsigned update manifest for distributing application updates. The manifest contains package URLs and SHA-256 hashes but is not digitally signed, so its authenticity relies solely on the underlying TLS channel. In affected versions, TLS certificate validation can be disabled when a proxy is configured, allowing an attacker who can intercept network traffic to supply a malicious update manifest and corresponding package with a matching hash. This can cause the client to download and install a tampered update, resulting in arbitrary code execution with the privileges of the GoSign Desktop user on Windows and macOS, or with elevated privileges on some Linux deployments. A local attacker who can modify proxy settings may also abuse this behavior to escalate privileges by forcing installation of a crafted update.

• https://infocert.digital/consumer/gosign-suite/ product
• https://www.vulncheck.com/advisories/gosign-desktop-insecure-update-mechanism-rce third-party-advisory
• https://www.ush.it/2025/11/14/multiple-vulnerabilities-gosign-desktop-remote-code-execution/ technical-descriptionexploit
• https://www.ush.it/2025/11/14/vulnerabilita-multiple-gosign-desktop-esecuzione-remota-codice-arbitrario/ technical-descriptionexploit