Apple macOS up to 10.12.1 OpenSSL out-of-bounds write

CVSS Meta Temp Score
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CTI Interest Score
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8.4$0-$5k0.00

Summaryinfo

A vulnerability was found in Apple macOS up to 10.12.1. It has been classified as critical. Impacted is an unknown function of the component OpenSSL. Performing a manipulation results in out-of-bounds write. This vulnerability is reported as CVE-2016-6303. The attack is possible to be carried out remotely. No exploit exists. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in Apple macOS up to 10.12.1 (Operating System). It has been classified as critical. This affects an unknown code block of the component OpenSSL. The manipulation with an unknown input leads to a out-of-bounds write vulnerability. CWE is classifying the issue as CWE-787. The product writes data past the end, or before the beginning, of the intended buffer. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

Integer overflow in the MDC2_Update function in crypto/mdc2/mdc2dgst.c in OpenSSL before 1.1.0 allows remote attackers to cause a denial of service (out-of-bounds write and application crash) or possibly have unspecified other impact via unknown vectors.

The bug was discovered 09/16/2016. The weakness was disclosed 12/13/2016 by Shi Lei as HT207423 as confirmed advisory (Website). It is possible to read the advisory at support.apple.com. This vulnerability is uniquely identified as CVE-2016-6303 since 07/26/2016. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. The technical details are unknown and an exploit is not publicly available. The advisory points out:

An overflow issue existed in MDC2_Update(). This issue was addressed through improved input validation.

The vulnerability scanner Nessus provides a plugin with the ID 95255 (AIX OpenSSL Advisory : openssl_advisory21.asc (SWEET32)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family AIX Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 316384 (Cisco Unity Express OpenSSL Multiple Vulnerabilities (cisco-sa-20160927-openssl)).

Upgrading to version 10.12.2 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 (95255) and SecurityFocus (BID 92984†). The entries VDB-87879, VDB-88080, VDB-90396 and VDB-90937 are pretty similar. Be aware that VulDB is the high quality source for vulnerability data.

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 8.5
VulDB Meta Temp Score: 8.4

VulDB Base Score: 7.3
VulDB Temp Score: 7.0
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 9.8
NVD Vector: 🔍

CVSSv2info

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

NVD Base Score: 🔍

Exploitinginfo

Class: Out-of-bounds write
CWE: CWE-787 / CWE-119
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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Nessus ID: 95255
Nessus Name: AIX OpenSSL Advisory : openssl_advisory21.asc (SWEET32)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 53466
OpenVAS Name: Ubuntu Update for openssl USN-3087-1
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

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

Upgrade: macOS 10.12.2
Patch: 55d83bf7c10c7b205fffa23fa7c3977491e56c07

Timelineinfo

07/26/2016 🔍
08/20/2016 +25 days 🔍
09/16/2016 +27 days 🔍
09/16/2016 +0 days 🔍
11/22/2016 +67 days 🔍
12/13/2016 +21 days 🔍
12/13/2016 +0 days 🔍
12/14/2016 +1 days 🔍
10/08/2022 +2124 days 🔍

Sourcesinfo

Vendor: apple.com

Advisory: HT207423
Researcher: Shi Lei
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2016-6303 (🔍)
GCVE (CVE): GCVE-0-2016-6303
GCVE (VulDB): GCVE-100-94407

OVAL: 🔍

SecurityFocus: 92984 - OpenSSL CVE-2016-6303 Integer Overflow Vulnerability
SecurityTracker: 1036885

scip Labs: https://www.scip.ch/en/?labs.20180712
See also: 🔍

Entryinfo

Created: 12/14/2016 13:38
Updated: 10/08/2022 08:23
Changes: 12/14/2016 13:38 (74), 07/07/2019 06:23 (12), 10/08/2022 08:23 (5)
Complete: 🔍
Cache ID: 216:DBF:103

Be aware that VulDB is the high quality source for vulnerability data.

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