CVE-2023-4039 Affecting libgcc package, versions <0:8.5.0-18.0.5.el8



    Attack Complexity High

    Threat Intelligence

    EPSS 0.05% (14th percentile)
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4.8 medium
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8.1 high
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Red Hat
4.8 medium

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  • Snyk ID SNYK-ORACLE8-LIBGCC-5893126
  • published 13 Sep 2023
  • disclosed 13 Sep 2023

How to fix?

Upgrade Oracle:8 libgcc to version 0:8.5.0-18.0.5.el8 or higher.
This issue was patched in ELSA-2023-12788.

NVD Description

Note: Versions mentioned in the description apply only to the upstream libgcc package and not the libgcc package as distributed by Oracle. See How to fix? for Oracle:8 relevant fixed versions and status.

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.