CVE-2026-101045 in Fleet
摘要
由 VulDB • 2026-09-27
Fleet-maintained app install and uninstall scripts for macOS are generated from Homebrew cask metadata. In manifests generated before 2026-08-19, the script generator escaped this metadata at some interpolation sites but not all of them, so cask metadata containing shell metacharacters (for example $(...) command substitution) could be carried into scripts that execute as root on managed macOS hosts. An attacker who could land crafted metadata in an upstream Homebrew cask — without needing any Fleet credentials — could achieve arbitrary command execution as root on managed macOS hosts that install or uninstall the affected Fleet-maintained app; exploitation required the crafted metadata to pass both upstream Homebrew cask review and Fleet's review of the automated ingestion pull request. The fix (fleetdm/fleet#51324) landed in Fleet's ingestion pipeline on 2026-08-19 so that all manifests generated on or after that date escape cask metadata at every interpolation site; because manifests are generated centrally and distributed as pre-built content, remediation applied to all deployments with no customer action, and the code fix is included in Fleet v4.92.0.
在 macOS 上由 Fleet 维护的应用程序安装和卸载脚本是根据 Homebrew cask 元数据生成的。在 2026-08-19 之前生成的清单中，脚本生成器仅在部分插值点转义了这些元数据，而非全部，因此包含 shell 特殊字符（例如 $(...) 命令替换）的 cask 元数据可能会被带入到在以 root 权限执行的受管 macOS 主机上的脚本中。攻击者若能在上游 Homebrew cask 中植入精心构造的元数据——且无需任何 Fleet 凭据——即可在安装了或卸载受影响的应用程序的受管 macOS 主机上以 root 身份实现任意命令执行；利用该漏洞要求所构造的元数据同时通过上游 Homebrew cask 审查以及 Fleet 对自动化摄入拉取请求（pull request）的审查。修复措施 (fleetdm/fleet#51324) 于 2026-08-19 部署至 Fleet 的摄入管道，使得所有在该日期或之后生成的清单在所有插值点均转义 cask 元数据；由于清单是集中生成并作为预构建内容分发的，因此修复措施适用于所有部署环境且无需客户采取任何操作，代码修复已包含在 Fleet v4.92.0 中。
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