VDB
CVE-2019-18276
CVE-2019-18276
PUBLISHED
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 50.23% · 97.9th percentile
Risk Scores
EPSS Score
50.23%
97.9th 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 |
Exploit Intelligence
- M-ensimag/CVE-2019-18276 (github-poc-repo)
- M-ensimag/CVE-2019-18276 (github-poc-repo)
- M-ensimag/CVE-2019-18276 (github-poc-repo)
- M-ensimag/CVE-2019-18276 (github-poc-repo)
- M-ensimag/CVE-2019-18276 (github-poc-repo)
- M-ensimag/CVE-2019-18276 (github-poc-repo)
- M-ensimag/CVE-2019-18276 (github-poc-repo)
- M-ensimag/CVE-2019-18276 (github-poc-repo)
- M-ensimag/CVE-2019-18276 (github-poc-repo)
- SABI-Ensimag/CVE-2019-18276 (github-poc-repo)
…and 48 more exploits
Timeline
- CVE Published
- Nov 29, 2019 PoC Published
- Apr 14, 2021 EPSS Score
- Aug 24, 2021 EPSS Score
- Oct 26, 2021 EPSS Score
- Jan 6, 2022 EPSS Score
- Feb 28, 2022 EPSS Score
- Apr 20, 2022 EPSS Score
- Jul 3, 2022 EPSS Score
- Nov 6, 2022 EPSS Score
- Mar 7, 2023 EPSS Score
- Mar 11, 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