Impact: Important Public Date: 2019-07-25 CWE: CWE-20 Bugzilla: 1731412: CVE-2019-13917 exim: ${sort} in configuration leads to privilege escalation Exim 4.85 through 4.92 (fixed in 4.92.1) allows remote code execution as root in some unusual configurations that use the ${sort } expansion for items that can be controlled by an attacker (e.g., $local_part or $domain).
The MITRE CVE dictionary describes this issue as:
Find out more about CVE-2019-13917 from the MITRE CVE dictionary dictionary and NIST NVD.
As per upstream, this exim security flaw only affects exim versions from 4.85 up to and including 4.92. Since Red Hat Enterprise Linux 5 ships exim-4.63, it is not affected by this flaw.
NOTE: The following CVSS v3 metrics and score provided are preliminary and subject to review.
| CVSS3 Base Score | 8.1 |
|---|---|
| CVSS3 Base Metrics | CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H |
| Attack Vector | Network |
| Attack Complexity | High |
| Privileges Required | None |
| User Interaction | None |
| Scope | Unchanged |
| Confidentiality | High |
| Integrity Impact | High |
| Availability Impact | High |
| Platform | Package | State |
|---|---|---|
| Red Hat Enterprise Linux 5 | exim | Not affected |
Do not use ${sort } in your exim configuration.
Vulmon