Dovecot up to 2.3.10.1 Submission/lmtp/lda recursion

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.

The vulnerability scanner Nessus provides a plugin with the ID 334524 (Oracle Linux 7 : dovecot (ELSA-2026-26564)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 2.3.11.3 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (334524). 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

Version

• 0.99.13
• 0.99.14
• 1.0
• 1.0 Beta2
• 1.0 Beta3
• 1.0 Beta7
• 1.0 Rc29
• 1.0.1
• 1.0.2
• 1.0.3
• 1.0.4
• 1.0.5
• 1.0.6
• 1.0.7
• 1.0.8
• 1.0.9
• 1.0.10
• 1.0.12
• 1.0.beta2
• 1.0.beta3
• 1.0.beta7
• 1.0.beta8
• 1.0.rc1
• 1.0.rc2
• 1.0.rc3
• 1.0.rc4
• 1.0.rc5
• 1.0.rc6
• 1.0.rc7
• 1.0.rc8
• 1.0.rc9
• 1.0.rc10
• 1.0.rc11
• 1.0.rc12
• 1.0.rc13
• 1.0.rc14
• 1.0.rc15
• 1.0.rc29
• 1.0beta2
• 1.0beta3
• 1.1
• 1.1.0
• 1.1.1
• 1.1.2
• 1.1.3
• 1.1.4
• 1.1.5
• 1.1.6
• 1.2.0
• 1.2.1
• 1.2.2
• 1.2.3
• 1.2.4
• 1.2.5
• 1.2.6
• 1.2.7
• 1.2.8
• 1.2.9
• 1.2.10
• 1.2.11
• 1.2.12
• 1.2.13
• 1.2.14
• 1.2.15
• 1.2.16
• 2.0.0
• 2.0.1
• 2.0.2
• 2.0.3
• 2.0.4
• 2.0.5
• 2.0.6
• 2.0.7
• 2.0.8
• 2.0.9
• 2.0.10
• 2.0.11
• 2.0.12
• 2.0.13
• 2.0.14
• 2.0.15
• 2.1
• 2.1.0
• 2.1.1
• 2.1.2
• 2.1.3
• 2.1.4
• 2.1.5
• 2.1.6
• 2.1.7
• 2.1.10
• 2.1.11
• 2.1.12
• 2.1.13
• 2.1.14
• 2.1.15
• 2.2
• 2.2.0
• 2.2.1
• 2.2.2
• 2.2.3
• 2.2.4
• 2.2.5
• 2.2.6
• 2.2.13
• 2.2.17
• 2.2.27
• 2.2.29
• 2.2.34
• 2.2.36.1
• 2.2.36.3
• 2.2.36.4
• 2.3.0
• 2.3.4.0
• 2.3.4.1
• 2.3.5.0
• 2.3.5.1
• 2.3.5.2
• 2.3.7.1
• 2.3.7.2
• 2.3.9.0
• 2.3.9.1
• 2.3.9.2
• 2.3.9.3
• 2.3.10.1

License

• open-source

CPE 2.3info

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CPE 2.2info

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CVSSv4info

CVSSv3info

CVSSv2info

Exploitinginfo

Threat Intelligenceinfo

Countermeasuresinfo

Timelineinfo

Sourcesinfo

Entryinfo

Be aware that VulDB is the high quality source for vulnerability data.

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