CVE-2026-47121— sparkle-project sparkle 路径遍历漏洞

Sparkle: Binary delta apply intermediate-symlink traversal in malicious .delta

Sparkle is a software update framework for macOS. Prior to version 2.9.2, `Autoupdate/SUBinaryDeltaApply.m` enforces `relativePath.pathComponents containsObject:@".."` and rejects writes whose immediate parent directory IS itself a symbolic link, but does not detect symlinks deeper in the relative path. `Autoupdate/SPUSparkleDeltaArchive.m`'s `extractItem:` will create symlinks in the destination tree from archive content (no `..` check on the symlink target), and a subsequent `Extract` item targeting `<symlink>/foo/bar` then escapes the destination tree via `fopen(path, "wb")` because the kernel resolves the intermediate symlink during the open call. This is a defense-in-depth issue: exploitation requires a maliciously-crafted `.delta` that passes EdDSA signature verification, i.e. EdDSA private-key compromise. With the AppInstaller running as root for system-domain installs, it gives the holder of a stolen signing key arbitrary file write at root level via the delta-apply path, which is a strictly broader primitive than the "drop-in replacement bundle" install they would otherwise have. Version 2.9.2 contains a patch for the issue.

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:N/I:H/A:N

对路径名的限制不恰当(路径遍历)

sparkle-project sparkle 路径遍历漏洞

sparkle-project sparkle是sparkle-project团队开源的一个软件更新框架。 sparkle-project sparkle 2.9.2之前版本存在安全漏洞，该漏洞源于SUBinaryDeltaApply.m对相对路径中的符号链接检测不足，且SPUSparkleDeltaArchive.m在提取归档内容时会创建符号链接，导致攻击者通过特制.delta文件利用符号链接逃逸目标目录，实现任意文件写入。

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