CVE-2025-11187

Technical Description

Issue summary: PBMAC1 parameters in PKCS#12 files are missing validation

which can trigger a stack-based buffer overflow, invalid pointer or NULL

pointer dereference during MAC verification.

Impact summary: The stack buffer overflow or NULL pointer dereference may

cause a crash leading to Denial of Service for an application that parses

untrusted PKCS#12 files. The buffer overflow may also potentially enable

code execution depending on platform mitigations.

When verifying a PKCS#12 file that uses PBMAC1 for the MAC, the PBKDF2

salt and keylength parameters from the file are used without validation.

If the value of keylength exceeds the size of the fixed stack buffer used

for the derived key (64 bytes), the key derivation will overflow the buffer.

The overflow length is attacker-controlled. Also, if the salt parameter is

not an OCTET STRING type this can lead to invalid or NULL pointer

dereference.

Exploiting this issue requires a user or application to process

a maliciously crafted

Remediation

Check the references section for vendor advisories and patches from openssl. Update openssl to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected Products

References