CVE-2020-8231
説明
A flaw was found in libcurl from versions 7.29.0 through 7.71.1. An application that performs multiple requests with libcurl's multi API, and sets the CURLOPT_CONNECT_ONLY option, might experience libcurl using the wrong connection. The highest threat from this vulnerability is to data confidentiality.
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 | 3.7 | 7.5 | N/A |
| 攻撃ベクトル | Network | Network | N/A |
| 攻撃の複雑さ | High | Low | N/A |
| 必要な権限 | None | None | N/A |
| ユーザー関与レベル | None | None | N/A |
| 範囲 | Unchanged | Unchanged | N/A |
| 機密性 | Low | 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:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
NVD: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Red Hat CVSS v3 スコアの説明
Access complexity has been set to high, as a special option has to be used and the issue only happens in rare cases. Confidentiality has been set to low, as the data leaked can't be easily be influenced by the attacker.
脆弱性の原因 (CWE) の理解
Confidentiality
Technical Impact: Read Memory
If the untrusted pointer is used in a read operation, an attacker might be able to read sensitive portions of memory.
Availability
Technical Impact: DoS: Crash, Exit, or Restart
If the untrusted pointer references a memory location that is not accessible to the product, or points to a location that is "malformed" or larger than expected by a read or write operation, the application may terminate unexpectedly.
Integrity,Confidentiality,Availability
Technical Impact: Execute Unauthorized Code or Commands; Modify Memory
If the untrusted pointer is used in a function call, or points to unexpected data in a write operation, then code execution may be possible.
謝辞
Red Hat would like to thank the Curl project for reporting this issue. Upstream acknowledges Marc Aldorasi as the original reporter.
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