CVE-2019-15846

Impact:
Critical
Public Date:
2019-09-06
Bugzilla:
1748397: CVE-2019-15846 exim: out-of-bounds access in string_interpret_escape() leading to buffer overflow in the SMTP delivery process

The MITRE CVE dictionary describes this issue as:

Exim before 4.92.2 allows remote attackers to execute arbitrary code as root via a trailing backslash.

Find out more about CVE-2019-15846 from the MITRE CVE dictionary dictionary and NIST NVD.

Statement

The flaw in the string_interpret_escape() function exists in the versions of Exim as shipped with Red Hat Enterprise Linux 5. However, it is not exposed to untrusted inputs and therefore it can not be exploited to achieve remote code execution. Refer to Red Hat Bugzilla bug 1748397 for further technical details: https://bugzilla.redhat.com/show_bug.cgi?id=1748397#c6

Exim mail server is not shipped with Red Hat Enterprise Linux 6, 7, and 8.

CVSS v3 metrics

NOTE: The following CVSS v3 metrics and score provided are preliminary and subject to review.

CVSS3 Base Score 9.8
CVSS3 Base Metrics CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality High
Integrity Impact High
Availability Impact High

Affected Packages State

Platform Package State
Red Hat Enterprise Linux 5 exim Will not fix
Unless explicitly stated as not affected, all previous versions of packages in any minor update stream of a product listed here should be assumed vulnerable, although may not have been subject to full analysis.

Acknowledgements

Red Hat would like to thank the Exim project for reporting this issue. Upstream acknowledges Zerons and Qualys as the original reporters.

External References

Last Modified

CVE description copyright © 2017, The MITRE Corporation