Risk | Low |
Patch available | YES |
Number of vulnerabilities | 1 |
CVE-ID | CVE-2019-20044 |
CWE-ID | CWE-273 |
Exploitation vector | Local |
Public exploit | Public exploit code for vulnerability #1 is available. |
Vulnerable software |
Red Hat Enterprise Linux EUS Compute Node Operating systems & Components / Operating system Red Hat Enterprise Linux for x86_64 - Extended Update Support Operating systems & Components / Operating system Red Hat Enterprise Linux Server - TUS Operating systems & Components / Operating system Red Hat Enterprise Linux for Power, little endian - Extended Update Support Operating systems & Components / Operating system Red Hat Enterprise Linux for Power, little endian Operating systems & Components / Operating system Red Hat Enterprise Linux for Power, big endian - Extended Update Support Operating systems & Components / Operating system Red Hat Enterprise Linux for Power, big endian Operating systems & Components / Operating system Red Hat Enterprise Linux for IBM z Systems - Extended Update Support Operating systems & Components / Operating system Red Hat Enterprise Linux Server - AUS Operating systems & Components / Operating system Red Hat Enterprise Linux for IBM z Systems Operating systems & Components / Operating system Red Hat Enterprise Linux for Scientific Computing Operating systems & Components / Operating system Red Hat Enterprise Linux Desktop Operating systems & Components / Operating system Red Hat Enterprise Linux Workstation Operating systems & Components / Operating system Red Hat Enterprise Linux Server Operating systems & Components / Operating system zsh (Red Hat package) Operating systems & Components / Operating system package or component |
Vendor | Red Hat Inc. |
Security Bulletin
This security bulletin contains one low risk vulnerability.
EUVDB-ID: #VU26210
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-2019-20044
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 due to Zsh fails to overwrite the saved uid, so the original privileges, dropped by the --no-PRIVILEGED option, can be restored by
executing MODULE_PATH=/dir/with/module zmodload with a module that calls
setuid(). A local user can execute arbitrary commands on the system with elevated privileges.
Install updates from vendor's website.
Red Hat Enterprise Linux EUS Compute Node: 7.7
Red Hat Enterprise Linux for x86_64 - Extended Update Support: 7.7
Red Hat Enterprise Linux Server - TUS: 7.7
Red Hat Enterprise Linux for Power, little endian - Extended Update Support: 7.7
Red Hat Enterprise Linux for Power, little endian: 7
Red Hat Enterprise Linux for Power, big endian - Extended Update Support: 7.7
Red Hat Enterprise Linux for Power, big endian: 7
Red Hat Enterprise Linux for IBM z Systems - Extended Update Support: 7.7
Red Hat Enterprise Linux Server - AUS: 7.7
Red Hat Enterprise Linux for IBM z Systems: 7
Red Hat Enterprise Linux for Scientific Computing: 7
Red Hat Enterprise Linux Desktop: 7
Red Hat Enterprise Linux Workstation: 7
Red Hat Enterprise Linux Server: 7
zsh (Red Hat package): before 5.0.2-34.el7_7.2
CPE2.3https://access.redhat.com/errata/RHSA-2020:0853
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.