HistoryEdit

RUSTSEC-2018-0002

Links in archives can overwrite any existing file

Issued
Package
tar (crates.io)
Type
Vulnerability
Keywords
#file-overwrite
Aliases
Details
https://github.com/alexcrichton/tar-rs/pull/156
CVSS Score
7.5 HIGH
CVSS Details
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
None
CVSS Vector
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Patched
  • >=0.4.16
Keywords
#file-overwrite

Description

When unpacking a tarball with the unpack_in-family of functions it's intended that only files within the specified directory are able to be written. Tarballs with hard links or symlinks, however, can be used to overwrite any file on the filesystem.

Tarballs can contain multiple entries for the same file. A tarball which first contains an entry for a hard link or symlink pointing to any file on the filesystem will have the link created, and then afterwards if the same file is listed in the tarball the hard link will be rewritten and any file can be rewritten on the filesystem.

This has been fixed in https://github.com/alexcrichton/tar-rs/pull/156 and is published as tar 0.4.16. Thanks to Max Justicz for discovering this and emailing about the issue!