VDB-159687 · CVE-2020-12100 · GCVE-0-2020-12100

Dovecot prior 2.3.11.3 Submission/lmtp/lda recursion

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
6.1	$0-$5k	0.00

Summaryinfo

A vulnerability has been found in Dovecot and classified as problematic. Affected by this vulnerability is an unknown functionality of the component Submission/lmtp/lda. Performing a manipulation results in recursion. This vulnerability is reported as CVE-2020-12100. The attack is possible to be carried out remotely. No exploit exists. The affected component should be upgraded.

Detailsinfo

A vulnerability classified as problematic has been found in Dovecot (Mail Server Software). This affects an unknown part of the component Submission/lmtp/lda. The manipulation with an unknown input leads to a recursion vulnerability. CWE is classifying the issue as CWE-674. The product does not properly control the amount of recursion that takes place, consuming excessive resources, such as allocated memory or the program stack. This is going to have an impact on availability. The summary by CVE is:

In Dovecot before 2.3.11.3, uncontrolled recursion in submission, lmtp, and lda allows remote attackers to cause a denial of service (resource consumption) via a crafted e-mail message with deeply nested MIME parts.

The weakness was disclosed 08/12/2020 (oss-sec). It is possible to read the advisory at openwall.com. This vulnerability is uniquely identified as CVE-2020-12100 since 04/23/2020. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1499 according to MITRE ATT&CK.

Upgrading to version 2.3.11.3 eliminates this vulnerability.

The entries VDB-159689 and VDB-159688 are pretty similar. Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Type

Mail Server Software

Name

Dovecot

License

open-source

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

AV	AC	Au	C	I	A
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Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Recursion
CWE: CWE-674 / CWE-404
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
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

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Dovecot 2.3.11.3

Timelineinfo

04/23/2020 🔍
08/12/2020 +111 days 🔍
08/13/2020 +1 days 🔍
08/13/2020 +0 days 🔍

Sourcesinfo

Advisory: openwall.com
Status: Not defined

CVE: CVE-2020-12100 (🔍)
GCVE (CVE): GCVE-0-2020-12100
GCVE (VulDB): GCVE-100-159687
See also: 🔍

Entryinfo

Created: 08/13/2020 06:38
Updated: 08/13/2020 06:43
Changes: 08/13/2020 06:38 (38), 08/13/2020 06:43 (18)
Complete: 🔍
Cache ID: 216::103