CVE-2018-20482
Published: August 31, 2023Last modified: August 31, 2023
Description
GNU Tar through 1.30, when --sparse is used, mishandles file shrinkage during read access, which allows local users to cause a denial of service (infinite read loop in sparse_dump_region in sparse.c) by modifying a file that is supposed to be archived by a different user's process (e.g., a system backup running as root).
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 4.7 |
| Attack Vector | LOCAL |
| Attack complexity | HIGH |
| Privileges required | LOW |
| User interaction | NONE |
| Scope | UNCHANGED |
| Confidentiality | NONE |
| Integrity impact | NONE |
| Availability impact | HIGH |
| Vector | CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H |
Status
| Product | Release | Package | Status |
|---|---|---|---|
| Alpaquita Linux | 23 LTS | tar | Not affected (1.34-r2) |
| Stream | tar | Not affected (1.35-r2) |
References
- http://git.savannah.gnu.org/cgit/tar.git/commit/?id=c15c42ccd1e2377945fd0414eca1a49294bff454
- http://lists.gnu.org/archive/html/bug-tar/2018-12/msg00023.html
- http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00077.html
- http://www.securityfocus.com/bid/106354
- https://lists.debian.org/debian-lts-announce/2018/12/msg00023.html
- https://lists.debian.org/debian-lts-announce/2021/11/msg00025.html
- https://news.ycombinator.com/item?id=18745431
- https://security.gentoo.org/glsa/201903-05
- https://twitter.com/thatcks/status/1076166645708668928
- https://utcc.utoronto.ca/~cks/space/blog/sysadmin/TarFindingTruncateBug