VDB-134024 · CVE-2019-10691 · Qualys 172355

Dovecot up to 2.3.5.1 JSON Encoder Username improper authentication

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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6.3$0-$5k0.00

Summaryinfo

A vulnerability, which was classified as problematic, was found in Dovecot up to 2.3.5.1. Affected by this vulnerability is an unknown functionality of the component JSON Encoder. Such manipulation as part of Username leads to improper authentication. This vulnerability is traded as CVE-2019-10691. The attack may be launched remotely. There is no exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in Dovecot up to 2.3.5.1 (Mail Server Software) and classified as problematic. Affected by this issue is some unknown functionality of the component JSON Encoder. The manipulation as part of a Username 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 availability. CVE summarizes:

The JSON encoder in Dovecot before 2.3.5.2 allows attackers to repeatedly crash the authentication service by attempting to authenticate with an invalid UTF-8 sequence as the username.

The bug was discovered 04/18/2019. The weakness was shared 04/24/2019 (Website). The advisory is shared for download at dovecot.org. This vulnerability is handled as CVE-2019-10691 since 04/02/2019. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. There are neither technical details nor an exploit publicly available.

The vulnerability was handled as a non-public zero-day exploit for at least 6 days. During that time the estimated underground price was around $0-$5k. The commercial vulnerability scanner Qualys is able to test this issue with plugin 172355 (OpenSUSE Security Update for dovecot23 (openSUSE-SU-2019:1312-1)).

Upgrading to version 2.3.5.2 eliminates this vulnerability.

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Productinfo

Type

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.4
VulDB Meta Temp Score: 6.3

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.5
NVD Vector: 🔍

CVSSv2info

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

NVD Base Score: 🔍

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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Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Dovecot 2.3.5.2

Timelineinfo

04/02/2019 🔍
04/18/2019 +16 days 🔍
04/24/2019 +6 days 🔍
04/25/2019 +1 days 🔍
09/06/2023 +1595 days 🔍

Sourcesinfo

Advisory: FEDORA-2019-1b61a528dd
Status: Not defined

CVE: CVE-2019-10691 (🔍)
GCVE (CVE): GCVE-0-2019-10691
GCVE (VulDB): GCVE-100-134024

Entryinfo

Created: 04/25/2019 08:12
Updated: 09/06/2023 19:28
Changes: 04/25/2019 08:12 (60), 06/01/2020 18:30 (1), 09/06/2023 19:28 (4)
Complete: 🔍
Cache ID: 216::103

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