Stack Buffer Overflow in OpenSSL PKCS#12 File Handling

CVE-2025-11187

What is CVE-2025-11187?

The OpenSSL library exposes a vulnerability in the handling of PBMAC1 parameters within PKCS#12 files due to missing validation. This flaw may lead to a stack-based buffer overflow, which could result in application crashes or, in certain cases, potentially allow malicious code execution. The issue arises when parameters such as PBKDF2 salt and keylength are processed without proper checks. If the keylength exceeds 64 bytes, the buffer will overflow, leading to undefined behavior. Furthermore, if the salt is incorrectly formatted, it can result in invalid pointer dereferences. Exploiting this vulnerability necessitates an application or user to process a maliciously crafted PKCS#12 file, emphasizing the importance of safeguarding against untrusted data.

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