CVE-2020-29660
説明
A locking inconsistency issue was discovered in the tty subsystem of the Linux kernel. A local user could use this flaw to read numerical value from memory after free.
詳細
This flaw is rated as having Low impact (Red Hat Enterprise Linux 7) because of the need to have CAP_SYS_TTY_CONFIG privileges.
This flaw is rated as having Moderate (Red Hat Enterprise Linux 8) impact because of the need to have CAP_SYS_TTY_CONFIG privileges. Red Hat Enterprise Linux 8 enabled unprivileged user/network namespaces by default which can be used to exercise this vulnerability.
軽減策
Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.
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 | 4.4 | 4.4 | N/A |
| 攻撃ベクトル | Local | Local | N/A |
| 攻撃の複雑さ | Low | Low | N/A |
| 必要な権限 | High | High | N/A |
| ユーザー関与レベル | None | None | N/A |
| 範囲 | Unchanged | Unchanged | N/A |
| 機密性 | High | High | N/A |
| 完全性への影響 | None | None | N/A |
| 可用性への影響 | None | None | N/A |
ベクトル
Red Hat: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N
NVD: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N
脆弱性の原因 (CWE) の理解
Integrity,Availability
Technical Impact: Modify Application Data; DoS: Instability; DoS: Crash, Exit, or Restart
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