CVE-2023-4039

Description

**DISPUTED**A failure in the -fstack-protector feature in GCC-based toolchains that target AArch64 allows an attacker to exploit an existing buffer overflow in dynamically-sized local variables in your application without this being detected. This stack-protector failure only applies to C99-style dynamically-sized local variables or those created using alloca(). The stack-protector operates as intended for statically-sized local variables. The default behavior when the stack-protector detects an overflow is to terminate your application, resulting in controlled loss of availability. An attacker who can exploit a buffer overflow without triggering the stack-protector might be able to change program flow control to cause an uncontrolled loss of availability or to go further and affect confidentiality or integrity. NOTE: The GCC project argues that this is a missed hardening bug and not a vulnerability by itself.

Weakness classification

• CWE-693: Protection Mechanism Failure

Primary references

• arm-security@arm.com — Exploit, Patch, Third Party Advisory
• arm-security@arm.com — Exploit, Patch, Third Party Advisory
• af854a3a-2127-422b-91ae-364da2661108 — Exploit, Patch, Third Party Advisory
• af854a3a-2127-422b-91ae-364da2661108 — Exploit, Patch, Third Party Advisory
• 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
• 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e