OpenSC: `sc_compacttlv_find_tag` can return out-of-bounds pointers

OpenSC is an open source smart card tools and middleware. Prior to version 0.27.0, sc_compacttlv_find_tag searches a compact-TLV buffer for a given tag. In compact-TLV, a single byte encodes the tag (high nibble) and value length (low nibble). With a 1-byte buffer {0x0A}, the encoded element claims tag=0 and length=10 but no value bytes follow. Calling sc_compacttlv_find_tag with search tag 0x00 returns a pointer equal to buf+1 and outlen=10 without verifying that the claimed value length fits within the remaining buffer. In cases where the sc_compacttlv_find_tag is provided untrusted data (such as being read from cards/files), attackers may be able to influence it to return out-of-bounds pointers leading to downstream memory corruption when subsequent code tries to dereference the pointer. This issue has been patched in version 0.27.0.

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

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OpenSC 安全漏洞

OpenSC是OpenSC开源的一款开源的智能卡工具和中间件。 OpenSC 0.27.0之前版本存在安全漏洞，该漏洞源于sc_compacttlv_find_tag函数未验证长度，可能导致返回越界指针并引发下游内存损坏。

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