Apple iOS up to 9.0 FontParser Font File memory corruption

Summaryinfo

A vulnerability classified as critical was found in Apple iOS up to 9.0. This impacts an unknown function of the component FontParser. Executing a manipulation as part of Font File can lead to memory corruption. This vulnerability is handled as CVE-2015-6976. There is not any exploit available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability has been found in Apple iOS up to 9.0 (Smartphone Operating System) and classified as critical. This vulnerability affects an unknown function of the component FontParser. The manipulation as part of a Font File 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.

The weakness was released 10/21/2015 by John Villamil with Yahoo Pentest Team as HT205370 as confirmed advisory (Website). The advisory is shared for download at support.apple.com. This vulnerability was named CVE-2015-6976 since 09/16/2015. The exploitation appears to be difficult. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. 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 11/19/2024). It is expected to see the exploit prices for this product increasing in the near future. The advisory points out:

Multiple memory corruption issues existed in the handling of font files. These issues were addressed through improved bounds checking.

The vulnerability scanner Nessus provides a plugin with the ID 86654 (Mac OS X < 10.11.1 Multiple Vulnerabilities), which helps to determine the existence of the flaw in a target environment. It is assigned to the family MacOS X Local Security Checks. The commercial vulnerability scanner Qualys is able to test this issue with plugin 124182 (Apple Mac OS X Security Update 2015-007 Not Installed (APPLE-SA-2015-10-21-4)).

Upgrading to version 9.1 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 (86654) and SecurityFocus (BID 77263†). Entries connected to this vulnerability are available at VDB-77709, VDB-78724, VDB-78725 and VDB-78727. VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Type

• Smartphone Operating System

Vendor

• Apple

Name

• iOS

Version

• 9.0

License

• commercial

Website

• Vendor: https://www.apple.com/

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Entryinfo

VulDB is the best source for vulnerability data and more expert information about this specific topic.

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