Vulnerability Description
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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Gnu | Bash | <= 5.0 |
| Netapp | Hci Management Node | - |
| Netapp | Oncommand Unified Manager | >= 9.5 |
| Netapp | Solidfire | - |
| Oracle | Communications Cloud Native Core Policy | 1.14.0 |
Related Weaknesses (CWE)
References
- http://packetstormsecurity.com/files/155498/Bash-5.0-Patch-11-Privilege-EscalatiExploitThird Party AdvisoryVDB Entry
- https://github.com/bminor/bash/commit/951bdaad7a18cc0dc1036bba86b18b90874d39ffPatchThird Party Advisory
- https://lists.apache.org/thread.html/rf9fa47ab66495c78bb4120b0754dd9531ca2ff0430
- https://security.gentoo.org/glsa/202105-34Third Party Advisory
- https://security.netapp.com/advisory/ntap-20200430-0003/Third Party Advisory
- https://www.oracle.com/security-alerts/cpuapr2022.htmlPatchThird Party Advisory
- https://www.youtube.com/watch?v=-wGtxJ8opa8ExploitThird Party Advisory
- http://packetstormsecurity.com/files/155498/Bash-5.0-Patch-11-Privilege-EscalatiExploitThird Party AdvisoryVDB Entry
- https://github.com/bminor/bash/commit/951bdaad7a18cc0dc1036bba86b18b90874d39ffPatchThird Party Advisory
- https://lists.apache.org/thread.html/rf9fa47ab66495c78bb4120b0754dd9531ca2ff0430
- https://security.gentoo.org/glsa/202105-34Third Party Advisory
- https://security.netapp.com/advisory/ntap-20200430-0003/Third Party Advisory
- https://www.oracle.com/security-alerts/cpuapr2022.htmlPatchThird Party Advisory
- https://www.youtube.com/watch?v=-wGtxJ8opa8ExploitThird Party Advisory
FAQ
What is CVE-2019-18276?
CVE-2019-18276 is a vulnerability with a CVSS score of 7.8 (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 settin...
How severe is CVE-2019-18276?
CVE-2019-18276 has been rated HIGH with a CVSS base score of 7.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2019-18276?
Check the references section above for vendor advisories and patch information. Affected products include: Gnu Bash, Netapp Hci Management Node, Netapp Oncommand Unified Manager, Netapp Solidfire, Oracle Communications Cloud Native Core Policy.