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CVE
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CVE-2017-2669Date: (C)2018-06-21   (M)2023-12-22


Dovecot before version 2.2.29 is vulnerable to a denial of service. When 'dict' passdb and userdb were used for user authentication, the username sent by the IMAP/POP3 client was sent through var_expand() to perform %variable expansion. Sending specially crafted %variable fields could result in excessive memory usage causing the process to crash (and restart), or excessive CPU usage causing all authentications to hang.

CVSS Score and Metrics +CVSS Score and Metrics -

CVSS V3 Severity:CVSS V2 Severity:
CVSS Score : 7.5CVSS Score : 5.0
Exploit Score: 3.9Exploit Score: 10.0
Impact Score: 3.6Impact Score: 2.9
 
CVSS V3 Metrics:CVSS V2 Metrics:
Attack Vector: NETWORKAccess Vector: NETWORK
Attack Complexity: LOWAccess Complexity: LOW
Privileges Required: NONEAuthentication: NONE
User Interaction: NONEConfidentiality: NONE
Scope: UNCHANGEDIntegrity: NONE
Confidentiality: NONEAvailability: PARTIAL
Integrity: NONE 
Availability: HIGH 
  
Reference:
BID-97536
DSA-3828
https://dovecot.org/pipermail/dovecot-news/2017-April/000341.html
http://www.openwall.com/lists/oss-security/2017/04/11/1
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2017-2669
https://github.com/dovecot/core/commit/000030feb7a30f193197f1aab8a7b04a26b42735.patch

CPE    2
cpe:/a:dovecot:dovecot
cpe:/o:debian:debian_linux:8.0
CWE    1
CWE-20
OVAL    6
oval:org.secpod.oval:def:89044658
oval:org.secpod.oval:def:112324
oval:org.secpod.oval:def:703562
oval:org.secpod.oval:def:112322
...

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