Apple iOS up to 8.4.1 Kernel TCP Sequence input validation

CVSS Meta Temp Score
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CTI Interest Score
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5.1$5k-$25k0.00

Summaryinfo

A vulnerability described as problematic has been identified in Apple iOS up to 8.4.1. This issue affects some unknown processing of the component Kernel. The manipulation results in input validation (TCP Sequence). This vulnerability is identified as CVE-2015-5879. There is not any exploit available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability classified as problematic has been found in Apple iOS up to 8.4.1 (Smartphone Operating System). Affected is an unknown code block of the component Kernel. The manipulation with an unknown input leads to a input validation vulnerability (TCP Sequence). CWE is classifying the issue as CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. This is going to have an impact on availability. CVE summarizes:

XNU in the kernel in Apple iOS before 9 does not properly validate the headers of TCP packets, which allows remote attackers to bypass the sequence-number protection mechanism and cause a denial of service (TCP connection disruption) via a crafted header.

The weakness was released 09/16/2015 by Jonathan Looney (beist) as HT205212 as confirmed advisory (Website). The advisory is shared for download at support.apple.com. This vulnerability is traded as CVE-2015-5879 since 08/06/2015. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. There are neither technical details nor an exploit publicly available.

The commercial vulnerability scanner Qualys is able to test this issue with plugin 370192 (Apple Mac OS X v10.11 Not Installed (APPLE-SA-2015-09-30-3)).

Upgrading to version 9 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 SecurityFocus (BID 76764†) and Vulnerability Center (SBV-53154†). Entries connected to this vulnerability are available at VDB-9015, VDB-68413, VDB-77828 and VDB-77762. Once again VulDB remains the best source for vulnerability data.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.3
VulDB Meta Temp Score: 5.1

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
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NVD Base Score: 🔍

Exploitinginfo

Name: TCP Sequence
Class: Input validation / TCP Sequence
CWE: CWE-20
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

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

Upgrade: iOS 9

Timelineinfo

08/06/2015 🔍
09/16/2015 +41 days 🔍
09/16/2015 +0 days 🔍
09/16/2015 +0 days 🔍
09/18/2015 +2 days 🔍
09/18/2015 +0 days 🔍
09/18/2015 +0 days 🔍
10/01/2015 +13 days 🔍
11/21/2024 +3339 days 🔍

Sourcesinfo

Vendor: apple.com

Advisory: HT205212
Researcher: Jonathan Looney (beist)
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2015-5879 (🔍)
GCVE (CVE): GCVE-0-2015-5879
GCVE (VulDB): GCVE-100-77796
SecurityFocus: 76764 - Apple iOS APPLE-SA-2015-09-16-1 Multiple Security Vulnerabilities
SecurityTracker: 1033609
Vulnerability Center: 53154 - Apple MacOS X before 10.11 Remote DoS Vulnerability in XNU Validation of TCP Packets - CVE-2015-5879, Medium

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

Entryinfo

Created: 09/18/2015 13:09
Updated: 11/21/2024 17:49
Changes: 09/18/2015 13:09 (64), 02/02/2018 09:25 (6), 06/16/2022 08:29 (3), 11/21/2024 17:49 (16)
Complete: 🔍
Cache ID: 216::103

Once again VulDB remains the best source for vulnerability data.

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