Risk | Low |
Patch available | YES |
Number of vulnerabilities | 1 |
CVE-ID | CVE-2019-18276 |
CWE-ID | CWE-273 |
Exploitation vector | Local |
Public exploit | Public exploit code for vulnerability #1 is available. |
Vulnerable software |
Ubuntu Operating systems & Components / Operating system bash (Ubuntu package) Operating systems & Components / Operating system package or component |
Vendor | Canonical Ltd. |
Security Bulletin
This security bulletin contains one low risk vulnerability.
EUVDB-ID: #VU24690
Risk: Low
CVSSv4.0: 7.1 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/U:Clear]
CVE-ID: CVE-2019-18276
CWE-ID:
CWE-273 - Improper Check for Dropped Privileges
Exploit availability: Yes
DescriptionThe vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists in "disable_priv_mode()" function in shell.c due to the affected software attempts to drop privileges but does not check or incorrectly checks to see if the drop succeeded. A local user 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.
MitigationUpdate the affected package bash to the latest version.
Vulnerable software versionsUbuntu: 14.04 - 20.04
bash (Ubuntu package): before 4.4.18-2ubuntu1.3
CPE2.3https://ubuntu.com/security/notices/USN-5380-1
Q & A
Can this vulnerability be exploited remotely?
No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.