CVE-2023-49284— Github fish 安全漏洞
一分钟漏洞结论
影响对象
fish-shell fish-shell
利用判断
尚无明确在野利用证据，仍需结合暴露面评估
建议动作
优先检查厂商安全公告和参考链接中的修复版本；无法立即升级时，限制受影响服务暴露并加强监测。
Github fish是一个智能且用户友好的命令行 shell。 Github fish 3.6.2之前版本存在安全漏洞，该漏洞源于允许在内部使用某些Unicode非字符来标记通配符和扩展。
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一、 漏洞 CVE-2023-49284 基础信息
漏洞信息
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Vulnerability Title
Command substitution output can trigger shell expansion in fish shell
来源: CVE Program / CVE List V5
Vulnerability Description
fish is a smart and user-friendly command line shell for macOS, Linux, and the rest of the family. fish shell uses certain Unicode non-characters internally for marking wildcards and expansions. It will incorrectly allow these markers to be read on command substitution output, rather than transforming them into a safe internal representation. While this may cause unexpected behavior with direct input (for example, echo \UFDD2HOME has the same output as echo $HOME), this may become a minor security problem if the output is being fed from an external program into a command substitution where this output may not be expected. This design flaw was introduced in very early versions of fish, predating the version control system, and is thought to be present in every version of fish released in the last 15 years or more, although with different characters. Code execution does not appear to be possible, but denial of service (through large brace expansion) or information disclosure (such as variable expansion) is potentially possible under certain circumstances. fish shell 3.6.2 has been released to correct this issue. Users are advised to upgrade. There are no known workarounds for this vulnerability.
来源: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:L/I:N/A:L
来源: CVE Program / CVE List V5
Vulnerability Type
解释冲突
来源: CVE Program / CVE List V5
Vulnerability Title
Github fish 安全漏洞
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Description
Github fish是一个智能且用户友好的命令行 shell。 Github fish 3.6.2之前版本存在安全漏洞，该漏洞源于允许在内部使用某些Unicode非字符来标记通配符和扩展。
来源: 中国国家信息安全漏洞库 CNNVD
CVSS Information
N/A
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Type
N/A
来源: 中国国家信息安全漏洞库 CNNVD
受影响产品
| 厂商 | 产品 | 影响版本 | CPE | 订阅 |
|---|---|---|---|---|
| fish-shell | fish-shell | < 3.6.2 | - |
|
二、漏洞 CVE-2023-49284 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2023-49284 补丁与修复 (1)
CVE-2023-49284 厂商安全公告 (1)
-
https://github.com/fish-shell/fish-shell/security/advisories/GHSA-2j9r-pm96-wp4f x_refsource_CONFIRM
CVE-2023-49284 邮件列表归档 (1)
IV. Related Vulnerabilities
Same product: fish-shell
Same vendor: fish-shell