Klapp App JSON Web Token improper authentication

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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3.7$0-$5k0.00

Summaryinfo

A vulnerability, which was classified as problematic, has been found in Klapp App. This impacts an unknown function of the component JSON Web Token Handler. The manipulation leads to improper authentication. This vulnerability is listed as CVE-2020-36533. The attack may be initiated remotely. There is no available exploit.

Detailsinfo

A vulnerability was found in Klapp App (affected version unknown) and classified as problematic. This issue affects an unknown functionality of the component JSON Web Token Handler. The manipulation with an unknown input leads to a improper authentication vulnerability. Using CWE to declare the problem leads to CWE-287. When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct. Impacted is confidentiality.

The bug was discovered 08/18/2020. The weakness was presented 09/07/2020 by Sven Fassbender with modzero AG as Knapp daneben ist auch vorbei as confirmed advisory (Website). It is possible to read the advisory at modzero.com. The public release was coordinated in cooperation with Klapp. The identification of this vulnerability is CVE-2020-36533. The exploitation is known to be difficult. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. The technical details are unknown and an exploit is not publicly available.

The vulnerability was handled as a non-public zero-day exploit for at least 20 days. During that time the estimated underground price was around $0-$5k.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

See VDB-160762 for similar entry. Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Vendor

Name

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 3.7
VulDB Meta Temp Score: 3.7

VulDB Base Score: 3.7
VulDB Temp Score: 3.7
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

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

Exploitinginfo

Class: Improper authentication
CWE: CWE-287
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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Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍

Timelineinfo

08/18/2020 🔍
08/19/2020 +1 days 🔍
08/21/2020 +2 days 🔍
09/07/2020 +17 days 🔍
09/07/2020 +0 days 🔍
06/03/2022 +634 days 🔍

Sourcesinfo

Advisory: Knapp daneben ist auch vorbei
Researcher: Sven Fassbender
Organization: modzero AG
Status: Confirmed
Coordinated: 🔍

CVE: CVE-2020-36533 (🔍)
GCVE (CVE): GCVE-0-2020-36533
GCVE (VulDB): GCVE-100-160763
See also: 🔍

Entryinfo

Created: 09/07/2020 13:09
Updated: 06/03/2022 20:36
Changes: 09/07/2020 13:09 (46), 09/07/2020 13:36 (2), 06/03/2022 20:36 (2)
Complete: 🔍
Cache ID: 216::103

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Discussion

 klapp (+0)
3 years ago
Upon being alerted to the vulnerability on August 18, 2020, Klapp swiftly contacted modzero AG to discuss necessary actions. Klapp confirmed and remedied the authorization code vulnerability by August 24, 2020. This issue, classified as non-public zero-day exploit for at 6 days, affected the authorization component isolated to members of a class, leading to a potential information disclosure. We emphasize that the security and privacy of our users are our top priorities. We have taken immediate action to mitigate this vulnerability and have enhanced our systems to prevent similar issues in the future.

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