CVE-2023-1175
Description
A flaw was found in Vim. There is an incorrect calculation of buffer size issue found in Vim's yank_copy_line() function of the register.c file. This flaw allows illegal memory access when using virtual editing as "startspaces" goes negative. An attacker can trick a user into opening a specially crafted file, triggering an issue that causes an application to crash leading to a denial of service, corrupting memory, and possibly executing code.
Statement
Red Hat Product Security has rated this issue as having a Low security impact, because the "victim" has to run an untrusted file IN SCRIPT MODE. Someone who is running untrusted files in script mode is equivalent to someone just taking a random python script and running it.
Since Red Hat Enterprise Linux 6, 7 are Out-of-Support-Scope for Low/Moderate flaws, the issue is not currently planned to be addressed in future updates for RHEL-6,7. Only Important and Critical severity flaws will be addressed at this time.
For additional information, refer to the Issue Severity Classification: https://access.redhat.com/security/updates/classification/ and Red Hat Enterprise Linux Life Cycle & Updates Policy: https://access.redhat.com/support/policy/updates/errata/.
Mitigation
Untrusted vim scripts with -s [scriptin] are not recommended to run.
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 | 5.3 | 6.6 | 7.3 |
| Attack Vector | Local | Local | Local |
| Attack Complexity | Low | Low | Low |
| Privileges Required | None | None | Low |
| User Interaction | Required | Required | Required |
| Scope | Unchanged | Unchanged | Unchanged |
| Confidentiality | Low | Low | High |
| Integrity Impact | Low | Low | High |
| Availability Impact | Low | High | High |
Vector
Red Hat: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L
NVD: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:H
cve.org: CVSS:3.0/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
Red Hat CVSS v3 Score Explanation
PR:N: Because, no privileges required for attacker prior to attack as an attacker just have to pass malicious file to "vim" remotely or locally (Eg: via email or pen-drive and ask victim user just to open it in application), Hence, no privileges are needed, hence, PR:N
C:L, I:L:- because as per attack scenario, the victim user running vim with a malicious file (e.g. coming from an attacker) in -s [Script mode]. As such a crash does not pose any real security risk, unless it can be proven that the triggered issue can be used to send/modify valuable information to/by a remote/local attacker. So, most likely it will cause DoS, and crashing the application would not be a persistent denial of service, as an application should be relaunched and victim needs to reopen the malicious file again to re-crash. Hence, A:L.
Understanding the Weakness (CWE)
Integrity,Availability,Confidentiality
Technical Impact: DoS: Crash, Exit, or Restart; Execute Unauthorized Code or Commands; Read Memory; Modify Memory
If the incorrect calculation is used in the context of memory allocation, then the software may create a buffer that is smaller or larger than expected. If the allocated buffer is smaller than expected, this could lead to an out-of-bounds read or write (CWE-119), possibly causing a crash, allowing arbitrary code execution, or exposing sensitive data.
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