CVE-2020-28026
Publication date 4 May 2021
Last updated 24 July 2024
Ubuntu priority
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.
Status
| Package | Ubuntu Release | Status |
|---|---|---|
| exim4 | 22.04 LTS jammy |
Fixed 4.94-15ubuntu1.2
|
| 20.04 LTS focal |
Fixed 4.93-13ubuntu1.5
|
|
| 18.04 LTS bionic |
Fixed 4.90.1-1ubuntu1.8
|
|
| 16.04 LTS xenial |
Fixed 4.86.2-2ubuntu2.6+esm1
|
|
| 14.04 LTS trusty |
Fixed 4.82-3ubuntu2.4+esm3
|
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Get Ubuntu ProSeverity score breakdown
| Parameter | Value |
|---|---|
| Base score |
9.8 · Critical
|
| Attack vector | Network |
| Attack complexity | Low |
| Privileges required | None |
| User interaction | None |
| Scope | Unchanged |
| Confidentiality | High |
| Integrity impact | High |
| Availability impact | High |
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
References
Related Ubuntu Security Notices (USN)
- USN-4934-1
- Exim vulnerabilities
- 4 May 2021
- USN-4934-2
- Exim vulnerabilities
- 6 May 2021