Buffer overflow in Oracle HTTP Server
CVE-2021-4034
A local privilege escalation vulnerability was found on polkit's pkexec utility. The pkexec application is a setuid tool designed to allow unprivileged users to run commands as privileged users according predefined policies. The current version of pkexec doesn't handle the calling parameters count correctly and ends trying to execute environment variables as commands. An attacker can leverage this by crafting environment variables in such a way it'll induce pkexec to execute arbitrary code. When successfully executed the attack can cause a local privilege escalation given unprivileged users administrative rights on the target machine.
Vulnerability class: Buffer Overflow
EPSS: 0.949 (99.9th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
Affected products
- Oracle Http_server — versions 12.2.1.3.0, 12.2.1.4.0
- Oracle Zfs_storage_appliance_kit — versions 8.8
- Polkit_project Polkit
- Siemens Scalance_lpe9403
- Siemens Scalance_lpe9403_firmware
- Siemens Sinumerik_edge
- Starwindsoftware Command_center — versions 1.0
- Starwindsoftware Starwind_virtual_san — versions v8
- Canonical Ubuntu_linux — versions 14.04, 16.04, 18.04
- Redhat Enterprise_linux — versions 8.0
Weakness classification (CWE)
CISA KEV (Known Exploited Vulnerabilities)
This CVE is on the CISA KEV catalog, added on . CISA KEV inclusion means CISA has confirmed in-the-wild exploitation; US federal agencies are required to remediate within a published due date.
BOD 22-01 due date: .
Required action: Apply updates per vendor instructions.
Known ransomware campaign use: yes.
Public proof-of-concept exploits
References
- secalert@redhat.com (Mitigation, Vendor Advisory)
- secalert@redhat.com (Exploit, Third Party Advisory, Mitigation)
- secalert@redhat.com (Patch, Issue Tracking)
- secalert@redhat.com (Patch)
- secalert@redhat.com (Patch, Third Party Advisory)
- secalert@redhat.com (Exploit, VDB Entry, Third Party Advisory)
- secalert@redhat.com (VDB Entry, Third Party Advisory)
- secalert@redhat.com (Third Party Advisory)
- secalert@redhat.com (Third Party Advisory)
- secalert@redhat.com (Third Party Advisory)
Frequently asked questions
- What is CVE-2021-4034?
- CVE-2021-4034 is a high-severity vulnerability in Oracle HTTP Server, classified under Out-of-bounds Write. CVSS score: 7.8/10. Published 2022-01-28.
- How severe is CVE-2021-4034?
- High severity. CVSS v3 base score is 7.8 out of 10.
- Is CVE-2021-4034 known to be exploited?
- Yes. CVE-2021-4034 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2022-06-27), indicating it is being actively exploited. 598 public proof-of-concept repositories are indexed.