CVE-2026-42497— Pear Archive_Tar 安全漏洞

Archive::Tar versions before 3.08 for Perl extract hardlinks to attacker controlled paths outside the extraction directory

Archive::Tar versions before 3.08 for Perl extract hardlinks to attacker controlled paths outside the extraction directory. _make_special_file() passes the tar header's linkname to link() without validating it against absolute paths or .. segments, creating a hardlink that shares the victim file's inode. A subsequent write through the extracted name modifies the victim file, and the post-extraction chmod, chown, and utime block in _extract_file() (guarded only against symlinks via -l) applies the tar header's mode, owner, and timestamps to the shared inode during extraction alone.

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在文件访问前对链接解析不恰当(链接跟随)

Pear Archive_Tar 安全漏洞

Pear Archive_Tar是PEAR团队的一个基于Php的可以对tar包进行创建、提取等操作的软件。 Pear Archive_Tar 3.08之前版本存在安全漏洞，该漏洞源于_make_special_file()函数将tar标头的linkname传递给link()时未验证绝对路径或..段，创建与受害者文件共享inode的硬链接，后续通过提取名称写入可修改受害者文件，且提取后的chmod、chown和utime块仅通过-l检查符号链接，导致在提取期间将tar标头的模式、所有者和时间戳应用于共享in

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