Out-of-Bounds

Affecting exim4 package, versions <4.92-8+deb10u6

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NVD Description

Note: Versions mentioned in the description apply to the upstream exim4 package. See Remediation section below for Debian:10 relevant versions.

Exim 4 before 4.94.2 allows Buffer Underwrite that may result in unauthenticated remote attackers executing arbitrary commands, because smtp_ungetc was only intended to push back characters, but can actually push back non-character error codes such as EOF.

Remediation

Upgrade Debian:10 exim4 to version 4.92-8+deb10u6 or higher.

References

CVSS Score

9.8
critical severity
  • Attack Vector
    Network
  • Attack Complexity
    Low
  • Privileges Required
    None
  • User Interaction
    None
  • Scope
    Unchanged
  • Confidentiality
    High
  • Integrity
    High
  • Availability
    High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVE
CVE-2020-28024
CWE
CWE-119
Snyk ID
SNYK-DEBIAN10-EXIM4-1279449
Disclosed
06 May, 2021
Published
05 May, 2021