VDB
CVE-2019-18276
CVE-2019-18276
PUBLISHED
CVSS 7.800000190734863 HIGH
An issue was discovered in disable_priv_mode in shell.c in GNU Bash through 5.0 patch 11. By default, if Bash is run with its effective UID not equal to its real UID, it will drop privileges by setting its effective UID to its real UID. However, it does so incorrectly. On Linux and other systems that support "saved UID" functionality, the saved UID is not dropped. An attacker with command execution in the shell can use "enable -f" for runtime loading of a new builtin, which can be a shared object that calls setuid() and therefore regains privileges. However, binaries running with an effective UID of 0 are unaffected.
EPSS 2.61% · 84.8th percentile
Risk Scores
CVSS 3.1
7.800000190734863
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS Score
2.61%
84.8th percentile
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Ubuntu:18.04:LTS | bash | 4.4.18-2ubuntu1.1, 0, 4.4-5ubuntu1 |
| Ubuntu:Pro:16.04:LTS | bash | 4.3-14ubuntu1.4, 0, 4.3-14ubuntu1 |
| Ubuntu:Pro:14.04:LTS | bash | 4.3-4ubuntu1, 4.3-7ubuntu1.1, 4.3-7ubuntu1.3 |
| Ubuntu:20.04:LTS | bash | 0, 5.0-4ubuntu1, 5.0-5ubuntu1 |
Timeline
- Nov 28, 2019 CVE Published
- Nov 29, 2019 PoC Published
- Apr 14, 2021 EPSS Score
- Aug 25, 2021 EPSS Score
- Oct 26, 2021 EPSS Score
- Jan 6, 2022 EPSS Score
- Mar 1, 2022 EPSS Score
- May 3, 2022 EPSS Score
- Jul 5, 2022 EPSS Score
- Nov 8, 2022 EPSS Score
- Mar 7, 2023 EPSS Score
- May 16, 2023 EPSS Score
References
- https://ubuntu.com/security/CVE-2019-18276 third-party-advisory
- https://www.youtube.com/watch?v=-wGtxJ8opa8 third-party-advisory
- https://ubuntu.com/security/notices/USN-5380-1 vendor-advisory
- https://www.cve.org/CVERecord?id=CVE-2019-18276 third-party-advisory