Loop with Unreachable Exit Condition ('Infinite Loop')

Affecting exim4 package, versions <4.89-2+deb9u2

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Overview

The receive_msg function in receive.c in the SMTP daemon in Exim 4.88 and 4.89 allows remote attackers to cause a denial of service (infinite loop and stack exhaustion) via vectors involving BDAT commands and an improper check for a '.' character signifying the end of the content, related to the bdat_getc function.

References

CVSS Score

7.5
high severity
  • Attack Vector
    Network
  • Attack Complexity
    Low
  • Privileges Required
    None
  • User Interaction
    None
  • Scope
    Unchanged
  • Confidentiality
    None
  • Integrity
    None
  • Availability
    High
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVE
CVE-2017-16944
CWE
CWE-835
Snyk ID
SNYK-DEBIAN9-EXIM4-382885
Disclosed
25 Nov, 2017
Published
25 Nov, 2017