View at Official debian advisory, NVD, CVE.org · CVE detail
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CVE-2023-4039 unimportant priority: Debian including 5 source packages (gcc-10, gcc-11, gcc-12, gcc-13, gcc-9), 11 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 8, open 3.
**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.