---
cve: "CVE-2023-4039"
severity: "MEDIUM"
cvss: 4.8
epss: "76%"
vendor: "GNU"
kev: false
exploited: false
published: "2023-09-13 09:15:15"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-09-07T03:56:57+02:00"
---

# CVE-2023-4039

> 4.8 MEDIUM · 🧪 PoC

## Beschreibung

**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.

## CVSS-Vektor

```
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Hoch | good |
| PR Privilegien | Keine | bad |
| UI Interaktion | Keine | bad |
| S Scope | Unverändert | good |
| C Vertraulichkeit | Gering | warn |
| I Integrität | Gering | warn |
| A Verfügbarkeit | Keine | good |

## Referenzen

- <https://developer.arm.com/Arm%20Security%20Center/GCC%20Stack%20Protector%20Vulnerability%20AArch64>
- <https://github.com/metaredteam/external-disclosures/security/advisories/GHSA-x7ch-h5rf-w2mf>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2023-4039) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_