Apple macOS up to 10.11 Kerberos v5 PAM module User information disclosure
CVSS Meta Temp Score | Current Exploit Price (≈) | CTI Interest Score |
---|---|---|
5.2 | $0-$5k | 0.00 |
A vulnerability has been found in Apple macOS up to 10.11 (Operating System) and classified as problematic. Affected by this vulnerability is an unknown code block of the component Kerberos v5 PAM module. The manipulation with an unknown input leads to a information disclosure vulnerability (User). The CWE definition for the vulnerability is CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. As an impact it is known to affect confidentiality. The summary by CVE is:
The Kerberos 5 (aka krb5) PAM module in Apple OS X before 10.12 does not use constant-time operations for determining username validity, which makes it easier for remote attackers to enumerate user accounts via a timing side-channel attack.
The weakness was presented 09/20/2016 by Meder Kydyraliev (Shrek_wzw) with Zero Day Initiative as HT207170 as confirmed advisory (Website). It is possible to read the advisory at support.apple.com. This vulnerability is known as CVE-2016-4745 since 05/11/2016. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1592 according to MITRE ATT&CK. The advisory points out:
A timing side channel allowed an attacker to determine the existence of user accounts on a system. This issue was addressed by introducing constant time checks.
The vulnerability scanner Nessus provides a plugin with the ID 93685 (macOS < 10.12 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.
Upgrading to version 10.12 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 (93685). See 89145, 91991, 92000 and 92001 for similar entries.
Product
Type
Vendor
Name
Version
License
CPE 2.3
CPE 2.2
CVSSv4
VulDB CVSS-B Score: 🔍VulDB CVSS-BT Score: 🔍
VulDB Vector: 🔍
VulDB Reliability: 🔍
CVSSv3
VulDB Meta Base Score: 5.3VulDB Meta Temp Score: 5.2
VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔍
VulDB Reliability: 🔍
NVD Base Score: 5.3
NVD Vector: 🔍
CVSSv2
AV | AC | Au | C | I | A |
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💳 | 💳 | 💳 | 💳 | 💳 | 💳 |
💳 | 💳 | 💳 | 💳 | 💳 | 💳 |
💳 | 💳 | 💳 | 💳 | 💳 | 💳 |
Vector | Complexity | Authentication | Confidentiality | Integrity | Availability |
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unlock | unlock | unlock | unlock | unlock | unlock |
unlock | unlock | unlock | unlock | unlock | unlock |
unlock | unlock | unlock | unlock | unlock | unlock |
VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍
NVD Base Score: 🔍
Exploiting
Name: UserClass: Information disclosure / User
CWE: CWE-200 / CWE-284 / CWE-266
ATT&CK: T1592
Local: No
Remote: Yes
Availability: 🔍
Status: Not defined
EPSS Score: 🔍
EPSS Percentile: 🔍
Price Prediction: 🔍
Current Price Estimation: 🔍
0-Day | unlock | unlock | unlock | unlock |
---|---|---|---|---|
Today | unlock | unlock | unlock | unlock |
Nessus ID: 93685
Nessus Name: macOS < 10.12 Multiple Vulnerabilities
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍
OpenVAS ID: 64377
OpenVAS Name: Apple Mac OS X Multiple Vulnerabilities-01 September-2016
OpenVAS File: 🔍
OpenVAS Family: 🔍
Threat Intelligence
Interest: 🔍Active Actors: 🔍
Active APT Groups: 🔍
Countermeasures
Recommended: UpgradeStatus: 🔍
Reaction Time: 🔍
0-Day Time: 🔍
Exposure Time: 🔍
Upgrade: macOS 10.12
Timeline
05/11/2016 🔍09/20/2016 🔍
09/20/2016 🔍
09/20/2016 🔍
09/23/2016 🔍
09/25/2016 🔍
09/26/2016 🔍
09/20/2022 🔍
Sources
Vendor: apple.comAdvisory: HT207170
Researcher: Meder Kydyraliev (Shrek_wzw)
Organization: Zero Day Initiative
Status: Confirmed
Confirmation: 🔍
CVE: CVE-2016-4745 (🔍)
SecurityTracker: 1036858
SecurityFocus: 93055 - Apple Mac OS X APPLE-SA-2016-09-20 Multiple Security Vulnerabilities
scip Labs: https://www.scip.ch/en/?labs.20180712
See also: 🔍
Entry
Created: 09/26/2016 11:50Updated: 09/20/2022 20:57
Changes: 09/26/2016 11:50 (70), 04/25/2019 19:07 (15), 09/20/2022 20:57 (3)
Complete: 🔍
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