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Category:   Application (E-mail Server)  >   Exim Vendors:   Exim.org
(Ubuntu Issues Fix) Exim Use-After-Free Memory Error in SMTP Service Lets Remote Users Execute Arbitrary Code on the Target System
SecurityTracker Alert ID:  1039874
SecurityTracker URL:  http://securitytracker.com/id/1039874
CVE Reference:   CVE-2017-16943   (Links to External Site)
Date:  Nov 27 2017
Impact:   Execution of arbitrary code via network, User access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  Exploit Included:  Yes  
Version(s): 4.88 - 4.89
Description:   A vulnerability was reported in Exim. A remote user can execute arbitrary code on the target system.

A remote user can connect to the SMTP service and send a specially crafted BDAT command to trigger a use-after-free memory error in the ESMTP CHUNKING extension and execute arbitrary code on the target system. The code will run with the privileges of the target service.

meh reported this vulnerability.

Impact:   A remote user can execute arbitrary code on the target system.
Solution:   Ubuntu has issued a fix.

The Ubuntu advisory is available at:

https://www.ubuntu.com/usn/usn-3493-1

Vendor URL:  www.ubuntu.com/usn/usn-3493-1 (Links to External Site)
Cause:   Access control error
Underlying OS:  Linux (Ubuntu)
Underlying OS Comments:  17.04, 17.10

Message History:   This archive entry is a follow-up to the message listed below.
Nov 27 2017 Exim Use-After-Free Memory Error in SMTP Service Lets Remote Users Execute Arbitrary Code on the Target System



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