Out-of-bounds write in OpenSSL PKCS12_get_friendlyname() UTF-8 conversion
CVE-2025-69419 is a low-severity memory corruption vulnerability in OpenSSL’s PKCS#12 handling, reachable via the public PKCS12_get_friendlyname() API when processing attacker-controlled PKCS#12 files. The flaw occurs during conversion of a PKCS#12 BMPString friendly name from UTF-16BE to UTF-8. In OPENSSL_uni2utf8(), the second-pass emission path uses bmp_to_utf8(), which incorrectly passes the remaining UTF-16 source byte count as the destination buffer capacity to UTF8_putc(). For non-ASCII BMP code points above U+07FF, UTF-8 encoding requires three bytes, but the forwarded capacity may be only two bytes. UTF8_putc() returns -1, that negative value is added to the output length without validation, and the subsequent trailing NUL byte is written at a negative offset. The result is a one-byte write before the start of a heap-allocated buffer. OpenSSL states that PKCS12_parse() uses a different code path and is not affected by this specific issue.
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An OpenSSL vulnerability patched by upgrading to OpenSSL 3.6.1 in IPFire Core Update 200.
Unknown (listed among related OpenSSL CVEs, but not described in the content).
Low-severity OpenSSL out-of-bounds write issue in PKCS#12 'friendlyname' handling, triggered by crafted PKCS#12 inputs.
An OpenSSL vulnerability mentioned as investigated and downgraded in severity; described as a one-byte write before a buffer and assessed as unlikely to yield code execution.
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