CVE-2022-34299
Description
A buffer-overflow vulnerability was found in libdwarf's dwarf_global_formref_b() function in dwarf_form.c. A carefully crafted .debug_info causes libdwarf to read outside a buffer containing a Dwarf_Sig8 symbolic reference. This issue can cause a segmentation violation or other major error, terminating the calling application and resulting in a denial of service.
Statement
The bug has been present since DWARF4 when DW_FORM_ref_sig8 was added to libdwarf. But, in our code-base, we cannot handle this functionality yet. There is no presence of vulnerable code in our code-base. Hence, versions of libdwarf shipped with Red Hat Enterprise Linux 7 & 8 are not affected by this flaw.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
The following CVSS metrics and score provided are preliminary and subject to review.
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 7.1 | 8.1 | N/A |
| Attack Vector | Network | Network | N/A |
| Attack Complexity | Low | Low | N/A |
| Privileges Required | None | None | N/A |
| User Interaction | Required | Required | N/A |
| Scope | Unchanged | Unchanged | N/A |
| Confidentiality | Low | High | N/A |
| Integrity Impact | None | None | N/A |
| Availability Impact | High | High | N/A |
Vector
Red Hat: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H
NVD: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H
Red Hat CVSS v3 Score Explanation
This issue can cause a segmentation violation or other major error, terminating the calling application and resulting in a denial of service. The highest impact is only to availability feature.
Understanding the Weakness (CWE)
Confidentiality
Technical Impact: Read Memory
Confidentiality
Technical Impact: Bypass Protection Mechanism
By reading out-of-bounds memory, an attacker might be able to get secret values, such as memory addresses, which can bypass protection mechanisms such as ASLR in order to improve the reliability and likelihood of exploiting a separate weakness to achieve code execution instead of just denial of service.
Availability,Integrity
Technical Impact: DoS: Crash, Exit, or Restart
An attacker might be able to cause a crash or other denial of service by causing the product to read a memory location that is not allowed (such as a segmentation fault), or to cause other conditions in which the read operation returns more data than is expected.
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