Allocation of Resources Without Limits or Throttling in cron (Debian package) - CVE-2019-9705
Published: May 11, 2022
Vulnerability identifier: #VU63054
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2019-9705
CWE-ID: CWE-770
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Debian
Affected software:
cron (Debian package)
cron (Debian package)
Detailed vulnerability description
The vulnerability allows a local user to perform a denial of service (DoS) attack.
The vulnerability exists due to Vixie Cron implementation allows unlimited number of lines to be inserted into the crontab file. A local user can create a very large crontab file and consume all available memory on the system.
How to mitigate CVE-2019-9705
Install updates from vendor's website.
Sources
- https://salsa.debian.org/debian/cron/commit/26814a26
- http://www.securityfocus.com/bid/107378
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/6DU7HAUAQR4E4AEBPYLUV6FZ4PHKH6A2/
- https://lists.debian.org/debian-lts-announce/2019/03/msg00025.html
- https://lists.debian.org/debian-lts-announce/2021/10/msg00029.html