Red Hat Enterprise Linux UEFI Secure Boot 7pk security

CVSS Meta Temp Score
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CTI Interest Score
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6.8$0-$5k0.00

Summaryinfo

A vulnerability was found in Red Hat Enterprise Linux. It has been rated as problematic. This impacts an unknown function of the component UEFI Secure Boot. The manipulation leads to 7pk security. This vulnerability is documented as CVE-2015-7837. The attack needs to be performed locally. There is not any exploit available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability, which was classified as critical, has been found in Red Hat Enterprise Linux (Operating System) (version unknown). This issue affects an unknown function of the component UEFI Secure Boot. The manipulation with an unknown input leads to a 7pk security vulnerability. Using CWE to declare the problem leads to CWE-254. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

The Linux kernel, as used in Red Hat Enterprise Linux 7, kernel-rt, and Enterprise MRG 2 and when booted with UEFI Secure Boot enabled, allows local users to bypass intended securelevel/secureboot restrictions by leveraging improper handling of secure_boot flag across kexec reboot.

The bug was discovered 10/14/2015. The weakness was released 09/19/2017 (oss-sec). The advisory is shared at openwall.com. The identification of this vulnerability is CVE-2015-7837 since 10/15/2015. The exploitation is known to be easy. An attack has to be approached locally. No form of authentication is needed for a successful exploitation. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1211 for this issue.

The vulnerability was handled as a non-public zero-day exploit for at least 47 days. During that time the estimated underground price was around $5k-$25k. The vulnerability scanner Nessus provides a plugin with the ID 87135 (CentOS 7 : kernel (CESA-2015:2152)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family CentOS Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 157890 (Oracle Enterprise Linux Security Update for Unbreakable Enterprise kernel (ELSA-2019-4316)).

Upgrading eliminates this vulnerability. A possible mitigation has been published before and not just after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (87135) and SecurityFocus (BID 77097†). Entries connected to this vulnerability are available at VDB-82949, VDB-90516, VDB-94954 and VDB-106678. Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.0
VulDB Meta Temp Score: 6.8

VulDB Base Score: 8.4
VulDB Temp Score: 8.0
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 5.5
NVD Vector: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: 7pk security
CWE: CWE-254
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: No

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 87135
Nessus Name: CentOS 7 : kernel (CESA-2015:2152)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 80056
OpenVAS Name: Oracle Linux Local Check: ELSA-2015-2152
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Patch: github.com

Timelineinfo

10/14/2015 🔍
10/15/2015 +1 days 🔍
10/15/2015 +0 days 🔍
11/30/2015 +46 days 🔍
12/02/2015 +2 days 🔍
09/19/2017 +657 days 🔍
09/19/2017 +0 days 🔍
09/20/2017 +1 days 🔍
12/29/2022 +1926 days 🔍

Sourcesinfo

Vendor: redhat.com

Advisory: RHSA-2015:2152
Researcher: Wade Mealing
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2015-7837 (🔍)
GCVE (CVE): GCVE-0-2015-7837
GCVE (VulDB): GCVE-100-106841
SecurityFocus: 77097 - Linux Kernel 'securelevel/secureboot' Local Security Bypass Vulnerability

See also: 🔍

Entryinfo

Created: 09/20/2017 08:59
Updated: 12/29/2022 13:07
Changes: 09/20/2017 08:59 (74), 11/17/2019 17:54 (5), 01/13/2021 12:55 (2), 12/29/2022 12:51 (4), 12/29/2022 12:59 (1), 12/29/2022 13:07 (1)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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