Ubuntu update for exim4
| Risk | Critical |
| Patch available | YES |
| Number of vulnerabilities | 3 |
| CVE-ID | CVE-2023-42114 CVE-2023-42115 CVE-2023-42116 |
| CWE-ID | CWE-125 CWE-787 CWE-121 |
| Exploitation vector | Network |
| Public exploit | Public exploit code for vulnerability #2 is available. |
| Vulnerable software |
Ubuntu Operating systems & Components / Operating system eximon4 (Ubuntu package) Operating systems & Components / Operating system package or component exim4-daemon-light (Ubuntu package) Operating systems & Components / Operating system package or component exim4-daemon-heavy (Ubuntu package) Operating systems & Components / Operating system package or component exim4-base (Ubuntu package) Operating systems & Components / Operating system package or component exim4 (Ubuntu package) Operating systems & Components / Operating system package or component |
| Vendor | Canonical Ltd. |
Security Bulletin
This security bulletin contains information about 3 vulnerabilities.
1) Out-of-bounds read
EUVDB-ID: #VU81251
Risk: Low
CVSSv4.0: 1.7 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]
CVE-ID: CVE-2023-42114
CWE-ID:
CWE-125 - Out-of-bounds read
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to gain access to potentially sensitive information.
The vulnerability exists due to a boundary condition when handling NTLM challenge requests. A remote attacker can send specially crafted data to the server, trigger an out-of-bounds read error and read contents of memory on the system.
MitigationUpdate the affected package exim4 to the latest version.
Vulnerable software versionsUbuntu: 14.04 - 23.04
eximon4 (Ubuntu package): before Ubuntu Pro
exim4-daemon-light (Ubuntu package): before Ubuntu Pro
exim4-daemon-heavy (Ubuntu package): before Ubuntu Pro
exim4-base (Ubuntu package): before Ubuntu Pro
exim4 (Ubuntu package): before Ubuntu Pro
CPE2.3- cpe:2.3:o:canonical:ubuntu:14.04:*:*:*:*:*:*:*
- cpe:2.3:o:canonical:ubuntu:16.04:*:*:*:*:*:*:*
- cpe:2.3:o:canonical:ubuntu:18.04:*:*:*:*:*:*:*
- cpe:2.3:o:canonical:ubuntu:20.04:*:*:*:*:*:*:*
- cpe:2.3:o:canonical:ubuntu:22.04:*:*:*:*:*:*:*
- cpe:2.3:o:canonical:ubuntu:23.04:*:*:*:*:*:*:*
- cpe:2.3:a:canonical:eximon4_ubuntu_package:*:*:*:*:*:ubuntu:*:*
- cpe:2.3:a:canonical:exim4-daemon-light_ubuntu_package:*:*:*:*:*:ubuntu:*:*
- cpe:2.3:a:canonical:exim4-daemon-heavy_ubuntu_package:*:*:*:*:*:ubuntu:*:*
- cpe:2.3:a:canonical:exim4-base_ubuntu_package:*:*:*:*:*:ubuntu:*:*
- cpe:2.3:a:canonical:exim4_ubuntu_package:*:*:*:*:*:ubuntu:*:*
https://ubuntu.com/security/notices/USN-6411-1
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
2) Out-of-bounds write
EUVDB-ID: #VU81252
Risk: Critical
CVSSv4.0: 8.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/U:Red]
CVE-ID: CVE-2023-42115
CWE-ID:
CWE-787 - Out-of-bounds write
Exploit availability: Yes
DescriptionThe vulnerability allows a remote attacker to compromise vulnerable system.
The vulnerability exists due to a boundary error when handling AUTH command. A remote non-authenticated attacker can send specially crafted data to the server, trigger an out-of-bounds write and execute arbitrary code on the target system.
MitigationUpdate the affected package exim4 to the latest version.
Vulnerable software versionsUbuntu: 14.04 - 23.04
eximon4 (Ubuntu package): before Ubuntu Pro
exim4-daemon-light (Ubuntu package): before Ubuntu Pro
exim4-daemon-heavy (Ubuntu package): before Ubuntu Pro
exim4-base (Ubuntu package): before Ubuntu Pro
exim4 (Ubuntu package): before Ubuntu Pro
CPE2.3- cpe:2.3:o:canonical:ubuntu:14.04:*:*:*:*:*:*:*
- cpe:2.3:o:canonical:ubuntu:16.04:*:*:*:*:*:*:*
- cpe:2.3:o:canonical:ubuntu:18.04:*:*:*:*:*:*:*
- cpe:2.3:o:canonical:ubuntu:20.04:*:*:*:*:*:*:*
- cpe:2.3:o:canonical:ubuntu:22.04:*:*:*:*:*:*:*
- cpe:2.3:o:canonical:ubuntu:23.04:*:*:*:*:*:*:*
- cpe:2.3:a:canonical:eximon4_ubuntu_package:*:*:*:*:*:ubuntu:*:*
- cpe:2.3:a:canonical:exim4-daemon-light_ubuntu_package:*:*:*:*:*:ubuntu:*:*
- cpe:2.3:a:canonical:exim4-daemon-heavy_ubuntu_package:*:*:*:*:*:ubuntu:*:*
- cpe:2.3:a:canonical:exim4-base_ubuntu_package:*:*:*:*:*:ubuntu:*:*
- cpe:2.3:a:canonical:exim4_ubuntu_package:*:*:*:*:*:ubuntu:*:*
https://ubuntu.com/security/notices/USN-6411-1
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.
3) Stack-based buffer overflow
EUVDB-ID: #VU81253
Risk: Critical
CVSSv4.0: 8.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Red]
CVE-ID: CVE-2023-42116
CWE-ID:
CWE-121 - Stack-based buffer overflow
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to a boundary error when handling NTLM challenge requests. A remote unauthenticated attacker can send specially crafted data to the server, trigger a stack-based buffer overflow and execute arbitrary code on the target system.
Update the affected package exim4 to the latest version.
Vulnerable software versionsUbuntu: 14.04 - 23.04
eximon4 (Ubuntu package): before Ubuntu Pro
exim4-daemon-light (Ubuntu package): before Ubuntu Pro
exim4-daemon-heavy (Ubuntu package): before Ubuntu Pro
exim4-base (Ubuntu package): before Ubuntu Pro
exim4 (Ubuntu package): before Ubuntu Pro
CPE2.3- cpe:2.3:o:canonical:ubuntu:14.04:*:*:*:*:*:*:*
- cpe:2.3:o:canonical:ubuntu:16.04:*:*:*:*:*:*:*
- cpe:2.3:o:canonical:ubuntu:18.04:*:*:*:*:*:*:*
- cpe:2.3:o:canonical:ubuntu:20.04:*:*:*:*:*:*:*
- cpe:2.3:o:canonical:ubuntu:22.04:*:*:*:*:*:*:*
- cpe:2.3:o:canonical:ubuntu:23.04:*:*:*:*:*:*:*
- cpe:2.3:a:canonical:eximon4_ubuntu_package:*:*:*:*:*:ubuntu:*:*
- cpe:2.3:a:canonical:exim4-daemon-light_ubuntu_package:*:*:*:*:*:ubuntu:*:*
- cpe:2.3:a:canonical:exim4-daemon-heavy_ubuntu_package:*:*:*:*:*:ubuntu:*:*
- cpe:2.3:a:canonical:exim4-base_ubuntu_package:*:*:*:*:*:ubuntu:*:*
- cpe:2.3:a:canonical:exim4_ubuntu_package:*:*:*:*:*:ubuntu:*:*
https://ubuntu.com/security/notices/USN-6411-1
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
