Remote code execution in Exim

Published: 2019-06-05 22:59:47 | Updated: 2019-06-05
Severity High
Patch available YES
Number of vulnerabilities 1
CVE ID CVE-2019-10149
CVSSv3 8.5 [CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]
CWE ID CWE-78
Exploitation vector Network
Public exploit N/A
Vulnerable software Exim
Vulnerable software versions Exim 4.87
Exim 4.87.1
Exim 4.88

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Vendor URL Exim

Security Advisory

1) OS Command Injection

Description

The vulnerability allows a remote attacker to execute arbitrary shell commands on the target system.

The vulnerability exists due to insufficient validation of email address within the deliver_message() function in /src/deliver.c. A remote unauthenticated attacker can send an email containing a specially crafted email address and execute arbitrary OS commands on the target system via execv() call with superuser privileges.

This vulnerability can be also exploited by authenticated local users to escalate privileges on the system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Remediation

Install updates from vendor's website.

External links

https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-10149
https://www.exim.org/static/doc/security/CVE-2019-10149.txt
https://www.qualys.com/2019/06/05/cve-2019-10149/return-wizard-rce-exim-abridged.txt

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