CVE-2018-12886: gcc from 4.1 (inclusive), through 8.0 (inclusive); +4 more affected products

Affected technology

gcc · from 4.1 (inclusive), through 8.0 (inclusive)
gnu

n/a · n/a
Vendor not specified by the source

SIMATIC S7-1500 CPU 1518-4 PN/DP MFP · V3.1.0 to before V3.1.5
Siemens

SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP · V3.1.0 to before V3.1.5
Siemens

SIPLUS S7-1500 CPU 1518-4 PN/DP MFP · V3.1.0 to before V3.1.5
Siemens

Description’s affected range: through 8 (under certain circumstances) generate instruction sequences when targeting ARM targets that spill the address of the stack protector guard

Component: Not specified by the source

Attack conditions (NVD, CVSS 3.0): Network (remote) · No privileges required · No user interaction required

What an attacker can do

The source says stack_protect_prologue in cfgexpand.c and stack_protect_epilogue in function.c in GNU Compiler Collection (GCC) 4.1 through 8 (under certain circumstances) generate instruction sequences when targeting ARM targets that spill the address of the stack protector guard, which allows an attacker to bypass the protection of -fstack-protector, -fstack-protector-all, -fstack-protector-strong, and -fstack-protector-explicit against stack overflow by controlling what the stack canary is compared against. NVD’s CVSS 3.0 assessment (base score 8.1/10) rates confidentiality, integrity and availability impact as high.