VDB-90364 · CVE-2014-9862 · BID 91824

FreeBSD up to 10.3-RELEASE-p6 bsdiff integer overflow

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7.5$0-$5k0.00

A vulnerability has been found in FreeBSD up to 10.3-RELEASE-p6 (Operating System) and classified as critical. This vulnerability affects an unknown functionality of the component bsdiff. The manipulation with an unknown input leads to a integer overflow vulnerability. The CWE definition for the vulnerability is CWE-190. The product performs a calculation that can produce an integer overflow or wraparound, when the logic assumes that the resulting value will always be larger than the original value. This can introduce other weaknesses when the calculation is used for resource management or execution control. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

Integer signedness error in bspatch.c in bspatch in bsdiff, as used in Apple OS X before 10.11.6 and other products, allows remote attackers to execute arbitrary code or cause a denial of service (heap-based buffer overflow) via a crafted patch file.

The weakness was shared 07/25/2016 by Stefan Esser with Zero Day Initiative as FreeBSD-SA-16:25.bspatch as confirmed advisory (Website). The advisory is shared for download at security.freebsd.org. This vulnerability was named CVE-2014-9862 since 06/09/2016. The exploitation appears to be easy. The attack needs to be approached locally. The successful exploitation needs a single authentication. There are neither technical details nor an exploit publicly available. The advisory points out:

The implementation of bspatch does not check for a negative value on numbers of bytes read from the diff and extra streams, allowing an attacker who can control the patch file to write at arbitrary locations in the heap.

The vulnerability scanner Nessus provides a plugin with the ID 92496 (Mac OS X 10.11.x < 10.11.6 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 and running in the context c. The commercial vulnerability scanner Qualys is able to test this issue with plugin 370095 (Apple Mac OS X v10.11.6 and Security Update 2016-004 Not Installed (APPLE-SA-2016-07-18-1)).

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 vulnerability database at Tenable (92496). The entries 88079, 89684, 89686 and 89687 are related to this item.

Productinfo

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CPE 2.3info

CPE 2.2info

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CVSSv3info

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

VulDB Base Score: 7.8
VulDB Temp Score: 7.5
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NVD Base Score: 7.8
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CVSSv2info

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Exploitinginfo

Class: Integer overflow
CWE: CWE-190 / CWE-189
ATT&CK: Unknown

Local: Yes
Remote: No

Availability: 🔍
Status: Not defined

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EPSS Percentile: 🔍

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Nessus ID: 92496
Nessus Name: Mac OS X 10.11.x < 10.11.6 Multiple Vulnerabilities
Nessus File: 🔍
Nessus Risk: 🔍
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OpenVAS ID: 63631
OpenVAS Name: Apple Mac OS X Multiple Vulnerabilities December-2016
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Threat Intelligenceinfo

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Countermeasuresinfo

Recommended: Patch
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Timelineinfo

06/09/2016 🔍
07/18/2016 +39 days 🔍
07/19/2016 +1 days 🔍
07/21/2016 +2 days 🔍
07/21/2016 +0 days 🔍
07/25/2016 +4 days 🔍
07/25/2016 +0 days 🔍
07/25/2016 +0 days 🔍
03/10/2019 +958 days 🔍

Sourcesinfo

Product: freebsd.org

Advisory: FreeBSD-SA-16:25.bspatch
Researcher: Stefan Esser
Organization: Zero Day Initiative
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2014-9862 (🔍)
SecurityTracker: 1036438
SecurityFocus: 91824 - Apple Mac OS X APPLE-SA-2016-07-18-1 Multiple Security Vulnerabilities

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Entryinfo

Created: 07/19/2016 19:29
Updated: 03/10/2019 13:33
Changes: 07/19/2016 19:29 (70), 03/10/2019 13:33 (16)
Complete: 🔍

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