openCryptoki: Memory safety vulnerabilities in BER/DER decoders in asn1.c

openCryptoki is a PKCS#11 library and provides tooling for Linux and AIX. In versions 3.26.0 and below, the BER/DER decoding functions in the shared common library (asn1.c) accept a raw pointer but no buffer length parameter, and trust attacker-controlled BER length fields without validating them against actual buffer boundaries. All primitive decoders are affected: ber_decode_INTEGER, ber_decode_SEQUENCE, ber_decode_OCTET_STRING, ber_decode_BIT_STRING, and ber_decode_CHOICE. Additionally, ber_decode_INTEGER can produce integer underflows when the encoded length is zero. An attacker supplying a malformed BER-encoded cryptographic object through PKCS#11 operations such as C_CreateObject or C_UnwrapKey, token loading from disk, or remote backend communication can trigger out-of-bounds reads. This affects all token backends (Soft, ICA, CCA, TPM, EP11, ICSF) since the vulnerable code is in the shared common library. A patch is available thorugh commit ed378f463ef73364c89feb0fc923f4dc867332a3.

CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H

跨界内存读

openCryptoki 安全漏洞

openCryptoki是openCryptoki开源的一个适用于 Linux 的 PKCS#11 库和工具。 openCryptoki 3.26.0及之前版本存在安全漏洞，该漏洞源于共享公共库中的BER/DER解码函数信任攻击者控制的BER长度字段而未验证缓冲区边界，可能导致越界读取，攻击者可通过提供格式错误的BER编码加密对象触发此漏洞。

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