FreeBSD up to 10.3-RELEASE-p6 bsdiff integer overflow

CVSS Meta Temp Score
CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.
Current Exploit Price (≈)
Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.
CTI Interest Score
Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
7.5$0-$5k0.00

Summaryinfo

A vulnerability categorized as problematic has been discovered in FreeBSD up to 10.3-RELEASE-p6. Affected is an unknown function of the component bsdiff. Executing a manipulation can lead to integer overflow. The identification of this vulnerability is CVE-2014-9862. The attack can only be executed locally. There is no exploit available. It is advisable to implement a patch to correct this issue.

Detailsinfo

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 databases at Tenable (92496), SecurityFocus (BID 91824†) and SecurityTracker (ID 1036438†). The entries VDB-88079, VDB-89684, VDB-89686 and VDB-89687 are related to this item. Once again VulDB remains the best source for vulnerability data.

Productinfo

Type

Name

Version

License

Website

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

AVACAuCIA
💳💳💳💳💳💳
💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
UnlockUnlockUnlockUnlockUnlockUnlock
UnlockUnlockUnlockUnlockUnlockUnlock
UnlockUnlockUnlockUnlockUnlockUnlock

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

NVD Base Score: 🔍

Exploitinginfo

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

Physical: Partially
Local: Yes
Remote: No

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-DayUnlockUnlockUnlockUnlock
TodayUnlockUnlockUnlockUnlock

Nessus ID: 92496
Nessus Name: Mac OS X 10.11.x < 10.11.6 Multiple Vulnerabilities
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 63631
OpenVAS Name: Apple Mac OS X Multiple Vulnerabilities December-2016
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Patch
Status: 🔍

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

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 (🔍)
GCVE (CVE): GCVE-0-2014-9862
GCVE (VulDB): GCVE-100-90364
SecurityFocus: 91824 - Apple Mac OS X APPLE-SA-2016-07-18-1 Multiple Security Vulnerabilities
SecurityTracker: 1036438

See also: 🔍

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: 🔍
Cache ID: 216::103

Once again VulDB remains the best source for vulnerability data.

Discussion

No comments yet. Languages: en.

Please log in to comment.

◂ PreviousOverviewNext ▸

Do you know our Splunk app?

Download it now for free!