CVE-2022-2869
Description
A flaw was found in libtiff's tiffcrop tool that has a uint32_t underflow, which leads to an out-of-bounds read and write in the extractContigSamples8bits routine. This flaw allows an attacker who supplies a crafted file to tiffcrop to trick a user into opening the crafted file with tiffcrop, causing a crash or potential further exploitations.
Statement
This flaw is present only in the tiffcrop tool, not in the libtiff library code.
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 | 5.5 | 5.5 | N/A |
| Attack Vector | Local | Local | 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 | None | None | N/A |
| Integrity Impact | None | None | N/A |
| Availability Impact | High | High | N/A |
Vector
Red Hat: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
NVD: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Red Hat CVSS v3 Score Explanation
C:N, I:N because as per attack scenario, the victim user running tiffcrop utility with a malicious file (e.g. coming from an attacker). As such a crash or an out-of-bound read does not pose any real security risk, unless it can be proven that the triggered oob-read can be used to send valuable information to a remote/local attacker. So, most likely it will cause DoS. Hence only harm to availability i.e. A:H
Understanding the Weakness (CWE)
Integrity
Technical Impact: Modify Memory; Execute Unauthorized Code or Commands
Write operations could cause memory corruption. In some cases, an adversary can modify control data such as return addresses in order to execute unexpected code.
Availability
Technical Impact: DoS: Crash, Exit, or Restart
Attempting to access out-of-range, invalid, or unauthorized memory could cause the product to crash.
Other
Technical Impact: Unexpected State
Subsequent write operations can produce undefined or unexpected results.
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