Arbitrary Argument Injection

Affecting exim4 package, versions <4.89-2+deb9u8

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NVD Description

Note: Versions mentioned in the description apply to the upstream exim4 package. See Remediation section below for Debian:9 relevant versions.

Exim 4 before 4.94.2 has Improper Neutralization of Line Delimiters, relevant in non-default configurations that enable Delivery Status Notification (DSN). Certain uses of ORCPT= can place a newline into a spool header file, and indirectly allow unauthenticated remote attackers to execute arbitrary commands as root.

Remediation

Upgrade Debian:9 exim4 to version 4.89-2+deb9u8 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-2020-28026
CWE
CWE-88
Snyk ID
SNYK-DEBIAN9-EXIM4-1279456
Disclosed
06 May, 2021
Published
05 May, 2021