Apple iOS/iPadOS up to 13.4.1 Bluetooth PRNG weak prng

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CVSS Meta Temp Score
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CTI Interest Score
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4.5$0-$5k0.00

A vulnerability was found in Apple iOS and iPadOS up to 13.4.1 (Smartphone Operating System). It has been declared as problematic. Affected by this vulnerability is an unknown function of the component Bluetooth. The manipulation with an unknown input leads to a weak encryption vulnerability (PRNG). The CWE definition for the vulnerability is CWE-338. As an impact it is known to affect confidentiality. The summary by CVE is:

Some Broadcom chips mishandle Bluetooth random-number generation because a low-entropy Pseudo Random Number Generator (PRNG) is used in situations where a Hardware Random Number Generator (HRNG) should have been used to prevent spoofing. This affects, for example, Samsung Galaxy S8, S8+, and Note8 devices with the BCM4361 chipset. The Samsung ID is SVE-2020-16882 (May 2020).

The weakness was presented 05/20/2020 as HT211168 as confirmed advisory (Website). It is possible to read the advisory at support.apple.com. This vulnerability is known as CVE-2020-6616 since 01/08/2020. Attacking locally is a requirement. The exploitation doesn't need any form of authentication. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 10/20/2020). It is expected to see the exploit prices for this product increasing in the near future.Due to its background and reception, this vulnerability has a historic impact. The advisory points out:

An issue existed with the use of a PRNG with low entropy. This issue was addressed with improved state management.

Upgrading to version 13.5 eliminates this vulnerability. A possible mitigation has been published immediately after the disclosure of the vulnerability.

See 154944, 155738, 155739 and 155740 for similar entries.

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VulDB Meta Base Score: 4.7
VulDB Meta Temp Score: 4.5

VulDB Base Score: 2.9
VulDB Temp Score: 2.8
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 6.5
NVD Vector: 🔒

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VulDB Base Score: 🔒
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VulDB Reliability: 🔍

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Exploitinginfoedit

Name: PRNG
Class: Weak encryption / PRNG
CWE: CWE-338
ATT&CK: Unknown

Local: Yes
Remote: No

Availability: 🔒
Status: Not defined

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfoedit

Threat: 🔍
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Countermeasuresinfoedit

Recommended: Upgrade
Status: 🔍

Reaction Time: 🔒
0-Day Time: 🔒
Exposure Time: 🔒

Upgrade: iOS/iPadOS 13.5

Timelineinfoedit

01/08/2020 CVE assigned
05/20/2020 +133 days Advisory disclosed
05/20/2020 +0 days Countermeasure disclosed
05/29/2020 +9 days VulDB entry created
10/20/2020 +144 days VulDB last update

Sourcesinfoedit

Vendor: https://www.apple.com/

Advisory: HT211168
Status: Confirmed
Confirmation: 🔒

CVE: CVE-2020-6616 (🔒)
scip Labs: https://www.scip.ch/en/?labs.20150917
See also: 🔒

Entryinfoedit

Created: 05/30/2020 12:39 AM
Updated: 10/20/2020 07:11 AM
Changes: (3) source_cve_assigned source_cve_nvd_summary advisory_confirm_url
Complete: 🔍

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