The demangle_template function in cplus-dem.c in GNU libiberty, as distributed in GNU Binutils 2.31.1, contains an integer overflow vulnerability (for "Create an array for saving the template argument values") that can trigger a heap-based buffer overflow, as demonstrated by nm.
The MITRE CVE dictionary describes this issue as:
Find out more about CVE-2018-20673 from the MITRE CVE dictionary dictionary and NIST NVD.
This issue did not affect the versions of gdb as shipped with Red Hat Enterprise Linux 7 and with Red Hat Developer Toolset 7 and 8 as they are compiled only for 64bit architectures, where the flaw is not present.
NOTE: The following CVSS v3 metrics and score provided are preliminary and subject to review.
| CVSS3 Base Score | 5.3 |
|---|---|
| CVSS3 Base Metrics | CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L |
| Attack Vector | Local |
| Attack Complexity | Low |
| Privileges Required | None |
| User Interaction | Required |
| Scope | Unchanged |
| Confidentiality | Low |
| Integrity Impact | Low |
| Availability Impact | Low |
| Platform | Package | State |
|---|---|---|
| Red Hat Virtualization 4 | gcc | Under investigation |
| Red Hat Virtualization 4 | gdb | Under investigation |
| Red Hat Enterprise Linux 7 | gcc | Affected |
| Red Hat Enterprise Linux 7 | binutils | Affected |
| Red Hat Enterprise Linux 7 | gdb | Not affected |
| Red Hat Enterprise Linux 6 | gcc | Will not fix |
| Red Hat Enterprise Linux 6 | gdb | Will not fix |
| Red Hat Enterprise Linux 6 | binutils | Will not fix |
| Red Hat Enterprise Linux 5 | gcc | Will not fix |
| Red Hat Enterprise Linux 5 | gdb | Will not fix |
| Red Hat Enterprise Linux 5 | binutils | Will not fix |
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