FreeBSD 9.3/10.1 sys_amd64 IRET access control

CVSS Meta Temp Score
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CTI Interest Score
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5.6$0-$5k0.00

Summaryinfo

A vulnerability was found in FreeBSD 9.3/10.1 and classified as problematic. This issue affects some unknown processing of the component sys_amd64 IRET Handler. The manipulation results in access control. This vulnerability is identified as CVE-2015-5675. There is not any exploit available. A patch should be applied to remediate this issue. VulDB is the best source for vulnerability data and more expert information about this specific topic.

Detailsinfo

A vulnerability, which was classified as problematic, was found in FreeBSD 9.3/10.1 (Operating System). Affected is an unknown code of the component sys_amd64 IRET Handler. The manipulation with an unknown input leads to a access control vulnerability. CWE is classifying the issue as CWE-264. This is going to have an impact on availability. CVE summarizes:

The sys_amd64 IRET Handler in the kernel in FreeBSD 9.3 and 10.1 allows local users to gain privileges or cause a denial of service (kernel panic).

The weakness was released 08/25/2015 by Konstantin Belousov and Andrew Lutomirski as FreeBSD-SA-15:21.amd64 as confirmed advisory (Website). The advisory is available at security.FreeBSD.org. This vulnerability is traded as CVE-2015-5675 since 07/26/2015. The exploitability is told to be easy. Local access is required to approach this attack. The exploitation doesn't require any form of authentication. The technical details are unknown and an exploit is not available. This vulnerability is assigned to T1068 by the MITRE ATT&CK project. The advisory points out:

FreeBSD/amd64 is commonly used on 64bit systems with AMD and Intel CPU's. The GS segment CPU register is used by both user processes and the kernel to conveniently access state data: 32-bit user processes use the register to manage per-thread data, while the kernel uses it to access per-processor data. The return from interrupt (IRET) instruction returns program control from an interrupt handler to the interrupted context.

The vulnerability scanner Nessus provides a plugin with the ID 92895 (FreeBSD : FreeBSD -- Local privilege escalation in IRET handler (0dfa5dde-600a-11e6-a6c3-14dae9d210b8)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family FreeBSD Local Security Checks.

Applying a patch is able to eliminate this problem. A possible mitigation has been published immediately after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at X-Force (105888), Tenable (92895), SecurityFocus (BID 76485†) and SecurityTracker (ID 1033376†). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.9
VulDB Meta Temp Score: 5.6

VulDB Base Score: 4.0
VulDB Temp Score: 3.5
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.8
NVD Vector: 🔍

CVSSv2info

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VulDB Base Score: 🔍
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Exploitinginfo

Class: Access control
CWE: CWE-264
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: No

Availability: 🔍
Status: Unproven

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 92895
Nessus Name: FreeBSD : FreeBSD -- Local privilege escalation in IRET handler (0dfa5dde-600a-11e6-a6c3-14dae9d210b8)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍

Threat Intelligenceinfo

Interest: 🔍
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Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Patch
Status: 🔍

Reaction Time: 🔍
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Timelineinfo

07/26/2015 🔍
08/25/2015 +30 days 🔍
08/25/2015 +0 days 🔍
08/25/2015 +0 days 🔍
08/26/2015 +1 days 🔍
08/27/2015 +1 days 🔍
10/10/2017 +775 days 🔍
06/13/2022 +1707 days 🔍

Sourcesinfo

Product: freebsd.org

Advisory: FreeBSD-SA-15:21.amd64
Researcher: Konstantin Belousov, Andrew Lutomirski
Status: Confirmed

CVE: CVE-2015-5675 (🔍)
GCVE (CVE): GCVE-0-2015-5675
GCVE (VulDB): GCVE-100-77466
X-Force: 105888 - FreeBSD IRET privilege escalation
SecurityFocus: 76485 - FreeBSD CVE-2015-5675 Local Privilege Escalation Vulnerability
SecurityTracker: 1033376

Entryinfo

Created: 08/27/2015 11:34 AM
Updated: 06/13/2022 03:23 PM
Changes: 08/27/2015 11:34 AM (65), 11/09/2017 08:34 AM (2), 06/13/2022 03:18 PM (13), 06/13/2022 03:23 PM (1)
Complete: 🔍
Cache ID: 244:637:40

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