// For flags

CVE-2019-11500

dovecot: improper NULL byte handling in IMAP and ManageSieve protocol parsers leads to out of bounds writes

Severity Score

9.8
*CVSS v3

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

1
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

-
*SSVC
Descriptions

In Dovecot before 2.2.36.4 and 2.3.x before 2.3.7.2 (and Pigeonhole before 0.5.7.2), protocol processing can fail for quoted strings. This occurs because '\0' characters are mishandled, and can lead to out-of-bounds writes and remote code execution.

En Dovecot versiones anteriores a 2.2.36.4 y versiones 2.3.x anteriores a 2.3.7.2 (y Pigeonhole versiones anteriores a 0.5.7.2), el procesamiento del protocolo puede fallar para cadenas entre comillas. Esto ocurre porque los caracteres '\0' se manejan inapropiadamente y pueden generar escrituras fuera de límites y ejecución de código remota.

A flaw was found in dovecot. IMAP and ManageSieve protocol parsers do not properly handle the NULL byte when scanning data in quoted strings which leads to an out of bounds heap memory write. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.

*Credits: N/A
CVSS Scores
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Attack Vector
Network
Attack Complexity
Low
Authentication
None
Confidentiality
Partial
Integrity
Partial
Availability
Partial
* Common Vulnerability Scoring System
SSVC
  • Decision:-
Exploitation
-
Automatable
-
Tech. Impact
-
* Organization's Worst-case Scenario
Timeline
  • 2019-04-24 CVE Reserved
  • 2019-08-28 CVE Published
  • 2024-08-04 CVE Updated
  • 2024-08-04 First Exploit
  • 2024-11-02 EPSS Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
CWE
  • CWE-20: Improper Input Validation
  • CWE-787: Out-of-bounds Write
CAPEC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Dovecot
Search vendor "Dovecot"
 Dovecot
Search vendor "Dovecot" for product "Dovecot"
 < 2.2.36.4
Search vendor "Dovecot" for product "Dovecot" and version " < 2.2.36.4"
-
Affected
Dovecot
Search vendor "Dovecot"
 Dovecot
Search vendor "Dovecot" for product "Dovecot"
 >= 2.3.0 < 2.3.7.2
Search vendor "Dovecot" for product "Dovecot" and version " >= 2.3.0 < 2.3.7.2"
-
Affected
Dovecot
Search vendor "Dovecot"
 Pigeonhole
Search vendor "Dovecot" for product "Pigeonhole"
 < 0.5.7.2
Search vendor "Dovecot" for product "Pigeonhole" and version " < 0.5.7.2"
-
Affected
Debian
Search vendor "Debian"
 Debian Linux
Search vendor "Debian" for product "Debian Linux"
 8.0
Search vendor "Debian" for product "Debian Linux" and version "8.0"
-
Affected
Fedoraproject
Search vendor "Fedoraproject"
 Fedora
Search vendor "Fedoraproject" for product "Fedora"
 30
Search vendor "Fedoraproject" for product "Fedora" and version "30"
-
Affected