CVE-2018-20482
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).
- Score
- CVSS 3.1 4.7 Medium
- Status
- Modified - cve@mitre.org
- Published
- 2018-12-26
- Last modified
- 2026-10-14
- Weaknesses
- CWE-835
Affected products
- Debian Linux (Debian)
- Tar (Gnu)
- Leap (Opensuse)
- Simatic S7-1500 Cpu 1518-4 Pndp Mfp (Siemens)
- Simatic S7-1500 Cpu 1518f-4 Pndp Mfp (Siemens)
- Siplus S7-1500 Cpu 1518-4 Pndp Mfp (Siemens)
References
- https://utcc.utoronto.ca/~cks/space/blog/sysadmin/TarFindingTruncateBug
- http://git.savannah.gnu.org/cgit/tar.git/commit/?id=c15c42ccd1e2377945fd0414eca1a49294bff454
- https://lists.debian.org/debian-lts-announce/2018/12/msg00023.html
- https://news.ycombinator.com/item?id=18745431
- http://www.securityfocus.com/bid/106354
- https://security.gentoo.org/glsa/201903-05
- http://lists.gnu.org/archive/html/bug-tar/2018-12/msg00023.html
- https://twitter.com/thatcks/status/1076166645708668928
- http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00077.html
- https://lists.debian.org/debian-lts-announce/2021/11/msg00025.html
- https://cert-portal.siemens.com/productcert/html/ssa-398330.html
