Auth bypass in GNU Bash
CVE-2019-9924
rbash in Bash before 4.4-beta2 did not prevent the shell user from modifying BASH_CMDS, thus allowing the user to execute any command with the permissions of the shell.
Vulnerability class: Broken Access Control
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.004 (31.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 32nd percentile — 31.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000
Affected products
- GNU Bash — versions 4.4
- NetApp Hci Management Node
- NetApp Solidfire
- Canonical Ubuntu Linux — versions 12.04, 14.04, 16.04
- Debian Linux — versions 8.0
- openSUSE Leap — versions 42.3
Weakness classification (CWE)
Public proof-of-concept exploits
References
- bugs.launchpad.net/ubuntu/+source/bash/+bug/1803441 (Third Party Advisory, Issue Tracking)
- git.savannah.gnu.org/cgit/bash.git/tree/CHANGES (Vendor Advisory)
- lists.debian.org/debian-lts-announce/2019/03/msg00028.html (mailing-list, Mailing List, Third Party Advisory)
- lists.opensuse.org/opensuse-security-announce/2019-04/msg00049.html (vendor-advisory, Mailing List, Third Party Advisory)
- security.netapp.com/advisory/ntap-20190411-0001/ (Third Party Advisory)
- usn.ubuntu.com/4058-1/ (vendor-advisory, Third Party Advisory)
- usn.ubuntu.com/4058-2/ (vendor-advisory, Third Party Advisory)
Frequently asked questions
- What is CVE-2019-9924?
- CVE-2019-9924 is a high-severity vulnerability in GNU Bash, classified under Missing Authorization. CVSS score: 7.8/10. Published 2019-03-22.
- How severe is CVE-2019-9924?
- High severity. CVSS v3 base score is 7.8 out of 10.
- Is CVE-2019-9924 known to be exploited?
- 7 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.