Vulnerability 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).
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Gnu | Tar | <= 1.30 |
| Debian | Debian Linux | 8.0 |
| Opensuse | Leap | 15.0 |
Related Weaknesses (CWE)
References
- http://git.savannah.gnu.org/cgit/tar.git/commit/?id=c15c42ccd1e2377945fd0414eca1PatchThird Party Advisory
- http://lists.gnu.org/archive/html/bug-tar/2018-12/msg00023.htmlThird Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00077.htmlMailing ListThird Party Advisory
- http://www.securityfocus.com/bid/106354Third Party AdvisoryVDB Entry
- https://lists.debian.org/debian-lts-announce/2018/12/msg00023.htmlMailing ListThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2021/11/msg00025.htmlMailing ListThird Party Advisory
- https://news.ycombinator.com/item?id=18745431ExploitThird Party Advisory
- https://security.gentoo.org/glsa/201903-05Third Party Advisory
- https://twitter.com/thatcks/status/1076166645708668928PatchThird Party Advisory
- https://utcc.utoronto.ca/~cks/space/blog/sysadmin/TarFindingTruncateBugPatchThird Party Advisory
- http://git.savannah.gnu.org/cgit/tar.git/commit/?id=c15c42ccd1e2377945fd0414eca1PatchThird Party Advisory
- http://lists.gnu.org/archive/html/bug-tar/2018-12/msg00023.htmlThird Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00077.htmlMailing ListThird Party Advisory
- http://www.securityfocus.com/bid/106354Third Party AdvisoryVDB Entry
- https://lists.debian.org/debian-lts-announce/2018/12/msg00023.htmlMailing ListThird Party Advisory
FAQ
What is CVE-2018-20482?
CVE-2018-20482 is a vulnerability with a CVSS score of 4.7 (MEDIUM). 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) ...
How severe is CVE-2018-20482?
CVE-2018-20482 has been rated MEDIUM with a CVSS base score of 4.7/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2018-20482?
Check the references section above for vendor advisories and patch information. Affected products include: Gnu Tar, Debian Debian Linux, Opensuse Leap.