Cloudflare circl prior 1.3.3 rand.Read exceptional condition

CVSS Meta Temp Score
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CTI Interest Score
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5.3$0-$5k0.00

Summaryinfo

A vulnerability described as problematic has been identified in Cloudflare circl. Affected is the function rand.Read. Such manipulation leads to exceptional condition. This vulnerability is referenced as CVE-2023-1732. The attack can only be performed from a local environment. No exploit is available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in Cloudflare circl (Cloud Software). It has been rated as problematic. Affected by this issue is the function rand.Read. The manipulation with an unknown input leads to a exceptional condition vulnerability. Using CWE to declare the problem leads to CWE-755. The product does not handle or incorrectly handles an exceptional condition. Impacted is confidentiality. CVE summarizes:

When sampling randomness for a shared secret, the implementation of Kyber and FrodoKEM, did not check whether crypto/rand.Read() returns an error. In rare deployment cases (error thrown by the Read() function), this could lead to a predictable shared secret. The tkn20 and blindrsa components did not check whether enough randomness was returned from the user provided randomness source. Typically the user provides crypto/rand.Reader, which in the vast majority of cases will always return the right number random bytes. In the cases where it does not, or the user provides a source that does not, the blinding for blindrsa is weak and integrity of the plaintext is not ensured in tkn20.

The weakness was published 05/10/2023 as GHSA-2q89-485c-9j2x. The advisory is available at github.com. This vulnerability is handled as CVE-2023-1732 since 03/30/2023. Technical details are known, but there is no available exploit.

Upgrading to version 1.3.3 eliminates this vulnerability.

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Productinfo

Type

Vendor

Name

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.3
VulDB Meta Temp Score: 5.3

VulDB Base Score: 2.5
VulDB Temp Score: 2.4
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 8.2
NVD Vector: 🔍

CNA Base Score: 5.3
CNA Vector (Cloudflare, Inc.): 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Exceptional condition
CWE: CWE-755
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: circl 1.3.3

Timelineinfo

03/30/2023 🔍
05/10/2023 +41 days 🔍
05/10/2023 +0 days 🔍
06/02/2023 +23 days 🔍

Sourcesinfo

Product: github.com

Advisory: GHSA-2q89-485c-9j2x
Status: Confirmed

CVE: CVE-2023-1732 (🔍)
GCVE (CVE): GCVE-0-2023-1732
GCVE (VulDB): GCVE-100-228590

Entryinfo

Created: 05/10/2023 18:18
Updated: 06/02/2023 10:25
Changes: 05/10/2023 18:18 (50), 06/02/2023 10:25 (11)
Complete: 🔍
Cache ID: 216::103

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