Apple macOS up to 10.12.1 curl use after free

CVSS Meta Temp Score
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CTI Interest Score
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9.6$0-$5k0.00

A vulnerability classified as very critical has been found in Apple macOS up to 10.12.1 (Operating System). This affects an unknown code block of the component curl. The manipulation with an unknown input leads to a use after free vulnerability. CWE is classifying the issue as CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

Use-after-free vulnerability in libcurl before 7.50.1 allows attackers to control which connection is used or possibly have unspecified other impact via unknown vectors.

The weakness was published 12/13/2016 as HT207423 as confirmed advisory (Website). The advisory is shared at support.apple.com. This vulnerability is uniquely identified as CVE-2016-5421 since 06/10/2016. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 10/07/2022). It is expected to see the exploit prices for this product increasing in the near future. The advisory points out:

Multiple issues existed in curl. These issues were addressed by updating to curl version 7.51.0.

The vulnerability scanner Nessus provides a plugin with the ID 92758 (Slackware 13.0 / 13.1 / 13.37 / 14.0 / 14.1 / 14.2 / current : curl (SSA:2016-219-01)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Slackware Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 175804 (Debian Security Update for curl (DSA 3638-1)).

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 vulnerability database at Tenable (92758). Similar entries are available at 90449, 90450, 91385 and 91680.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB CVSS-B Score: 🔍
VulDB CVSS-BT Score: 🔍
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 9.8
VulDB Meta Temp Score: 9.6

VulDB Base Score: 9.8
VulDB Temp Score: 9.4
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: Use after free
CWE: CWE-416 / CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 92758
Nessus Name: Slackware 13.0 / 13.1 / 13.37 / 14.0 / 14.1 / 14.2 / current : curl (SSA:2016-219-01)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 703638
OpenVAS Name: Debian Security Advisory DSA 3638-1 (curl - security update)
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

Timelineinfo

06/10/2016 🔍
08/03/2016 +54 days 🔍
08/08/2016 +5 days 🔍
08/10/2016 +2 days 🔍
12/13/2016 +125 days 🔍
12/13/2016 +0 days 🔍
12/16/2016 +3 days 🔍
10/07/2022 +2121 days 🔍

Sourcesinfo

Vendor: apple.com

Advisory: HT207423
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2016-5421 (🔍)
OVAL: 🔍

SecurityTracker: 1036536
SecurityFocus: 92306 - cURL/libcurl CVE-2016-5421 Local Use After Free Denial of Service Vulnerability

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

Entryinfo

Created: 12/16/2016 14:12
Updated: 10/07/2022 19:43
Changes: 12/16/2016 14:12 (72), 07/08/2019 15:53 (12), 10/07/2022 19:43 (3)
Complete: 🔍

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