CVE-2023-2203
Description
A flaw was found in the WebKitGTK package. An improper input validation issue may lead to a use-after-free vulnerability. This flaw allows attackers with network access to pass specially crafted web content files, causing a denial of service or arbitrary code execution. This CVE exists because of a CVE-2023-28205 security regression for the WebKitGTK package in Red Hat Enterprise Linux 8.8 and Red Hat Enterprise Linux 9.2.
Statement
This issue only affects Red Hat Enterprise Linux 8.8 and Red Hat Enterprise Linux 9.2, which introduced this regression via the following errata:
https://access.redhat.com/errata/RHSA-2023:2834 (Red Hat Enterprise Linux 8.8) https://access.redhat.com/errata/RHSA-2023:2256 (Red Hat Enterprise Linux 9.2)
These errata provided updates for WebKitGTK packages, but did not include fixes for CVE-2023-28205.
A user who installs or updates to Red Hat Enterprise Linux 8.8 or Red Hat Enterprise Linux 9.2 would be vulnerable to the CVE-2023-28205, even if they were properly fixed in Red Hat Enterprise Linux 8.7 and Red Hat Enterprise Linux 9.1. The CVE-2023-2203 was assigned to that Red Hat specific security regression and it is not applicable to any upstream WebKitGTK version or WebKitGTK packages of any other vendor that are not directly based on Red Hat Enterprise Linux packages.
For more details about the original security issue CVE-2023-28205, refer to the CVE page: https://access.redhat.com/security/cve/CVE-2023-28205.
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).
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 8.8 | 8.8 | N/A |
| Attack Vector | Network | Network | N/A |
| Attack Complexity | Low | Low | N/A |
| Privileges Required | None | Low | N/A |
| User Interaction | Required | None | N/A |
| Scope | Unchanged | Unchanged | N/A |
| Confidentiality | High | High | N/A |
| Integrity Impact | High | High | 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:H/I:H/A:H
NVD: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Understanding the Weakness (CWE)
Integrity
Technical Impact: Modify Memory
The use of previously freed memory may corrupt valid data, if the memory area in question has been allocated and used properly elsewhere.
Availability
Technical Impact: DoS: Crash, Exit, or Restart
If chunk consolidation occurs after the use of previously freed data, the process may crash when invalid data is used as chunk information.
Confidentiality
Technical Impact: Read Memory
Read operations on freed memory can sometimes leak sensitive information instead of causing a crash
Integrity,Confidentiality,Availability
Technical Impact: Execute Unauthorized Code or Commands
If malicious data is entered before chunk consolidation can take place, it may be possible to take advantage of a write-what-where primitive to execute arbitrary code. If the newly allocated data happens to hold a class, in C++ for example, various function pointers may be scattered within the heap data. If one of these function pointers is overwritten with an address to valid shellcode, execution of arbitrary code can be achieved.
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