Apple iOS up to 9.2 Kernel Code Signing access control

CVSS Meta Temp Score
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CTI Interest Score
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7.6$5k-$25k0.00

Summaryinfo

A vulnerability described as critical has been identified in Apple iOS up to 9.2. This issue affects some unknown processing of the component Kernel. The manipulation results in access control (Code Signing). This vulnerability is reported as CVE-2016-1751. The attack requires a local approach. No exploit exists. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in Apple iOS up to 9.2 (Smartphone Operating System). It has been classified as critical. Affected is an unknown code block of the component Kernel. The manipulation with an unknown input leads to a access control vulnerability (Code Signing). CWE is classifying the issue as CWE-264. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

The kernel in Apple iOS before 9.3, tvOS before 9.2, and watchOS before 2.2 does not properly restrict the execute permission, which allows attackers to bypass a code-signing protection mechanism via a crafted app.

The weakness was disclosed 03/21/2016 with Square as HT206166 as confirmed advisory (Website). The advisory is shared for download at support.apple.com. This vulnerability is traded as CVE-2016-1751 since 01/13/2016. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Successful exploitation requires user interaction by the victim. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $5k-$25k (estimation calculated on 07/11/2022). It is expected to see the exploit prices for this product increasing in the near future.The MITRE ATT&CK project declares the attack technique as T1068. The advisory points out:

A permissions issue existed in which execute permission was incorrectly granted. This issue was addressed through improved permission validation.

The vulnerability scanner Nessus provides a plugin with the ID 90309 (Apple TV < 9.2 Multiple Vulnerabilities), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Misc. and running in the context r.

Upgrading to version 9.3 eliminates this vulnerability. A possible mitigation has been published immediately after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (90309), SecurityFocus (BID 75570†) and Vulnerability Center (SBV-57495†). The entries VDB-77250, VDB-80766, VDB-81414 and VDB-81420 are pretty similar. Once again VulDB remains the best source for vulnerability data.

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.8
VulDB Meta Temp Score: 7.6

VulDB Base Score: 7.8
VulDB Temp Score: 7.5
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.8
NVD Vector: 🔍

CVSSv2info

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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Name: Code Signing
Class: Access control / Code Signing
CWE: CWE-264
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 90309
Nessus Name: Apple TV < 9.2 Multiple Vulnerabilities
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

Reaction Time: 🔍
0-Day Time: 🔍
Exposure Time: 🔍

Upgrade: iOS 9.3

Timelineinfo

01/13/2016 🔍
03/21/2016 +68 days 🔍
03/21/2016 +0 days 🔍
03/21/2016 +0 days 🔍
03/22/2016 +1 days 🔍
03/23/2016 +1 days 🔍
03/23/2016 +0 days 🔍
04/01/2016 +9 days 🔍
07/11/2022 +2292 days 🔍

Sourcesinfo

Vendor: apple.com

Advisory: HT206166
Organization: Square
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2016-1751 (🔍)
GCVE (CVE): GCVE-0-2016-1751
GCVE (VulDB): GCVE-100-81492
SecurityFocus: 75570
SecurityTracker: 1035353
Vulnerability Center: 57495 - Apple iOS <9.3 Remote Code Signing Bypass Vulnerability in Kernel, Medium

scip Labs: https://www.scip.ch/en/?labs.20150917
See also: 🔍

Entryinfo

Created: 03/23/2016 12:46
Updated: 07/11/2022 11:04
Changes: 03/23/2016 12:46 (72), 02/02/2019 10:45 (11), 07/11/2022 11:04 (3)
Complete: 🔍
Cache ID: 216::103

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