Capstone is a disassembly framework. In 6.0.0-Alpha9 and earlier, Capstone's arch/SH/SHDisassembler.c SH floating-point decoders such as opFADD, opFMUL, and opFSUB call set_reg() and set_reg_n() using sh_info.op.op_count without checking the fixed-size operands[] array. Repeated crafted instructions processed through cs_disasm_iter() or cs_disasm() with CS_ARCH_SH, CS_MODE_SH2A or CS_MODE_SH4A, CS_MODE_SHFPU, and CS_OPT_DETAIL can increment the operand count beyond the 176-byte sh_info allocation and perform a four-byte heap buffer overflow write.
The corruption can crash the process and may enable code execution depending on heap layout. This issue is fixed in version 6.0.0-Alpha10.
Attack Parameters
Attack Vector
Local
Requires local access
Attack Complexity
High
Difficult to exploit
Attack Requirements
Present
Additional conditions required
Privileges Required
None
No privileges needed
User Interaction
Passive
Minimal interaction
Impact Assessment
Confidentiality
High
Complete data leak
Integrity
High
Complete data modification
Availability
High
Complete denial of service
CVSS Vector v4.0
Weakness Type (CWE)
References 6
https://github.com/capstone-engine/capstone/commit/09e76802380b9e94d9720c44458d…
security-advisories@github.com
https://github.com/capstone-engine/capstone/commit/e17ee44a8307ea33375b4727ac4f…
security-advisories@github.com
https://github.com/capstone-engine/capstone/pull/2968
security-advisories@github.com
https://github.com/capstone-engine/capstone/pull/2969
security-advisories@github.com
https://github.com/capstone-engine/capstone/releases/tag/6.0.0-Alpha10
security-advisories@github.com
https://github.com/capstone-engine/capstone/security/advisories/GHSA-3hpv-wr3j-…
security-advisories@github.com