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CVE-2023-4039— GCC's-fstack-protector fails to guard dynamically-sized local variables on AArch64

Quick assessment

Affected
Arm Ltd Arm GNU Toolchain
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

GCC是一个 GNU 编译器集合。主要用于编译 C 和 C++ 语言。 GCC存在安全漏洞，该漏洞源于存在缓冲区溢出，可能导致可用性不受控制的损失或进一步影响机密性或完整性。

CVSS 4.8 · Medium EPSS 0.76% · P54

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 2

VendorProduct Version RangeStatus
Arm Ltd Arm GNU Toolchain All versions where option -fstack-protector is used affected
GNU GCC All versions of GCC that target AArch64 when option -fstack-protector is used affected
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I. Basic Information for CVE-2023-4039

Vulnerability Information
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Vulnerability Title
GCC's-fstack-protector fails to guard dynamically-sized local variables on AArch64
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
保护机制失效
Source: CVE Program / CVE List V5
Vulnerability Title
GCC 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
GCC是一个 GNU 编译器集合。主要用于编译 C 和 C++ 语言。 GCC存在安全漏洞，该漏洞源于存在缓冲区溢出，可能导致可用性不受控制的损失或进一步影响机密性或完整性。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Arm Ltd Arm GNU Toolchain All versions where option -fstack-protector is used -
GNU GCC All versions of GCC that target AArch64 when option -fstack-protector is used -

II. Public POCs for CVE-2023-4039

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III. Intelligence Information for CVE-2023-4039

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Other References for CVE-2023-4039 (1)

IV. Related Vulnerabilities

Same vendor: Arm Ltd
Same weakness: CWE-693

V. Comments for CVE-2023-4039

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