CVE-2023-4039
MediumCVSS 4.8Exploitation Probability (EPSS)
Low risk47th percentile - higher than 47% of all known CVEs
Summary
There is a failure in the -fstack-protector feature in GCC-based toolchains targeting AArch64, allowing an attacker to exploit an existing buffer overflow in dynamically-sized local variables in your application without detection. This issue only affects C99-style dynamically-sized local variables or those created using alloca().
Risk Assessment
An attacker may exploit a buffer overflow to change program flow control, potentially leading to uncontrolled loss of availability and possibly affecting confidentiality or integrity.
Recommendation
It is recommended to monitor applications for buffer overflows and consider updating GCC toolchains to mitigate risks associated with this issue.
Original NVD description (English source)
**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.