CVE-2026-67296
説明
A flaw was found in FreeRDP. A remote attacker can exploit a vulnerability in the Remote Desktop Protocol (RDP) Enhanced Input (RDPEI) server channel handler. By sending a malicious RDPEI message with an oversized declared body length, the attacker can force the server to allocate excessive memory, leading to a denial of service (DoS).
詳細
A Moderate denial of service (DoS) vulnerability in FreeRDP's RDPEI server channel affects systems acting as an RDP server or proxy. A remote, unauthenticated attacker can send a specially crafted RDP message to trigger excessive memory allocation, causing service disruption.
軽減策
To mitigate this do not expose FreeRDP server/proxy/shadow (freerdp-shadow-cli / freerdp-proxy) to untrusted networks—allow only trusted clients via firewall, or disable those services if unused.
CVSS (Common Vulnerability Scoring System) のスコアの詳細
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 スコアの内訳
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| ベーススコア | 6.5 | N/A | 7.5 |
| 攻撃ベクトル | Network | N/A | Network |
| 攻撃の複雑さ | Low | N/A | Low |
| 必要な権限 | Low | N/A | None |
| ユーザー関与レベル | None | N/A | None |
| 範囲 | Unchanged | N/A | Unchanged |
| 機密性 | None | N/A | None |
| 完全性への影響 | None | N/A | None |
| 可用性への影響 | High | N/A | High |
ベクトル
Red Hat: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
cve.org: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
脆弱性の原因 (CWE) の理解
Availability
Technical Impact: DoS: Crash, Exit, or Restart; DoS: Resource Consumption (CPU); DoS: Resource Consumption (Memory)
An attacker could provide unexpected values and cause a program crash or arbitrary control of resource allocation, leading to excessive consumption of resources such as memory and CPU.
Confidentiality
Technical Impact: Read Memory; Read Files or Directories
An attacker could read confidential data if they are able to control resource references.
Integrity,Confidentiality,Availability
Technical Impact: Modify Memory; Execute Unauthorized Code or Commands
An attacker could use malicious input to modify data or possibly alter control flow in unexpected ways, including arbitrary command execution.
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