Apple iOS up to 8.4.1 tidy memory corruption

CVSS Meta Temp Score
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CTI Interest Score
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6.6$0-$5k0.00

Summaryinfo

A vulnerability, which was classified as critical, was found in Apple iOS up to 8.4.1. The affected element is an unknown function of the component tidy. Executing a manipulation can lead to memory corruption. This vulnerability is tracked as CVE-2015-5523. Moreover, an exploit is present. You should upgrade the affected component.

Detailsinfo

A vulnerability classified as critical was found in Apple iOS up to 8.4.1 (Smartphone Operating System). This vulnerability affects some unknown functionality of the component tidy. The manipulation with an unknown input leads to a memory corruption vulnerability. The CWE definition for the vulnerability is CWE-119. The product performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

The ParseValue function in lexer.c in tidy before 4.9.31 allows remote attackers to cause a denial of service (crash) via vectors involving multiple whitespace characters before an empty href, which triggers a large memory allocation.

The weakness was disclosed 09/16/2015 by Fernando Muñoz with NULLGroup.com as HT205212 as confirmed advisory (Website). The advisory is available at support.apple.com. This vulnerability was named CVE-2015-5523 since 07/14/2015. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Technical details are unknown but a public exploit is available.

It is possible to download the exploit at securityfocus.com. It is declared as proof-of-concept. As 0-day the estimated underground price was around $100k and more. The vulnerability scanner Nessus provides a plugin with the ID 84831 (Debian DLA-273-1 : tidy security update), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Debian Local Security Checks. The commercial vulnerability scanner Qualys is able to test this issue with plugin 168028 (SUSE Enterprise Linux Security update for tidy (SUSE-SU-2015:1513-1)).

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 Tenable (84831), SecurityFocus (BID 75037†) and Vulnerability Center (SBV-53062†). The entries VDB-76963, VDB-76964, VDB-77828 and VDB-77762 are pretty similar. If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.3
VulDB Meta Temp Score: 6.6

VulDB Base Score: 7.3
VulDB Temp Score: 6.6
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

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

NVD Base Score: 🔍

Exploitinginfo

Class: Memory corruption
CWE: CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Access: Public
Status: Proof-of-Concept
Download: 🔍

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 84831
Nessus Name: Debian DLA-273-1 : tidy security update
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍

OpenVAS ID: 703309
OpenVAS Name: Debian Security Advisory DSA 3309-1 (tidy - security update)
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

Reaction Time: 🔍
Exposure Time: 🔍

Upgrade: iOS 9

Timelineinfo

06/04/2015 🔍
07/14/2015 +40 days 🔍
08/11/2015 +28 days 🔍
09/16/2015 +36 days 🔍
09/16/2015 +0 days 🔍
09/18/2015 +2 days 🔍
09/30/2015 +12 days 🔍
10/01/2015 +1 days 🔍
06/16/2022 +2450 days 🔍

Sourcesinfo

Vendor: apple.com

Advisory: HT205212
Researcher: Fernando Muñoz
Organization: NULLGroup.com
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2015-5523 (🔍)
GCVE (CVE): GCVE-0-2015-5523
GCVE (VulDB): GCVE-100-77842

OVAL: 🔍

SecurityFocus: 75037 - Tidy 'tmbstr.c' Heap Based Buffer Overflow Vulnerability
SecurityTracker: 1033703
Vulnerability Center: 53062 - Apple WatchOS <2 Remote Code Execution due to a Memory Corruption Issue in Tidy - CVE-2015-5523, Medium

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

Entryinfo

Created: 09/18/2015 13:09
Updated: 06/16/2022 13:44
Changes: 09/18/2015 13:09 (69), 02/01/2018 07:15 (14), 06/16/2022 13:38 (3), 06/16/2022 13:44 (1)
Complete: 🔍
Cache ID: 216:A10:103

If you want to get best quality of vulnerability data, you may have to visit VulDB.

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