Bug 1215785 (CVE-2023-42115)

Summary: VUL-0: CVE-2023-42115: exim: AUTH Out-Of-Bounds Write Remote Code Execution Vulnerability
Product: [openSUSE] openSUSE Distribution Reporter: SMASH SMASH <smash_bz>
Component: SoundAssignee: Peter Wullinger <wullinger>
Status: RESOLVED FIXED QA Contact: Security Team bot <security-team>
Severity: Critical    
Priority: P3 - Medium CC: abergmann, ddavis
Version: Leap 15.6   
Target Milestone: ---   
Hardware: Other   
OS: Other   
URL: https://smash.suse.de/issue/380212/
Whiteboard:
Found By: Security Response Team Services Priority:
Business Priority: Blocker: ---
Marketing QA Status: --- IT Deployment: ---

Description SMASH SMASH 2023-09-28 06:37:34 UTC 
This vulnerability allows remote attackers to execute arbitrary code on affected
installations of Exim. Authentication is not required to exploit this
vulnerability.

The specific flaw exists within the smtp service, which listens on TCP port 25
by default. The issue results from the lack of proper validation of
user-supplied data, which can result in a write past the end of a buffer. An
attacker can leverage this vulnerability to execute code in the context of the
service account.

06/06/22 – ZDI requested a PSIRT contact.

06/14/22 – ZDI reported the vulnerability to the vendor.

04/25/23 – ZDI asked for an update.

04/25/23 – The vendor asked us to re-send the reports.

05/10/23 – ZDI sent the vulnerability to the vendor.

09/25/23 – ZDI asked for an update and informed the vendor that we intend to
publish the case as a zero-day advisory on 09/27/23.

-- Mitigation: Given the nature of the vulnerability, the only salient
mitigation strategy is to restrict interaction with the application.

References:
http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2023-42115
Comment 1 OBSbugzilla Bot 2023-10-02 14:35:03 UTC 
This is an autogenerated message for OBS integration:
This bug (1215785) was mentioned in
https://build.opensuse.org/request/show/1114823 Backports:SLE-12-SP4+Backports:SLE-15-SP4+Backports:SLE-15-SP5 / exim
https://build.opensuse.org/request/show/1114826 Factory / exim
Comment 2 Peter Wullinger 2023-10-04 06:34:59 UTC 
fixed in exim 4.96.1, Backports exim 4.94 has a patch.
Comment 3 Marcus Meissner 2023-10-05 13:05:42 UTC 
openSUSE-SU-2023:0293-1: An update that fixes three vulnerabilities is now available.

Category: security (critical)
Bug References: 1215784,1215785,1215786
CVE References: CVE-2023-42114,CVE-2023-42115,CVE-2023-42116
JIRA References: 
Sources used:
openSUSE Backports SLE-15-SP5 (src):    exim-4.94.2-bp155.5.3.1
openSUSE Backports SLE-15-SP4 (src):    exim-4.94.2-bp154.2.6.1
Comment 4 OBSbugzilla Bot 2024-07-15 17:05:24 UTC 
This is an autogenerated message for OBS integration:
This bug (1215785) was mentioned in
https://build.opensuse.org/request/show/1187597 Backports:SLE-15-SP6 / exim