exim4: Exim SMTP Challenge Stack-based Buffer Overflow Remote Code Execution Vulnerability
CVE-2023-42116 is fixed in 6 products on 1 platform, first by exim4 4.90.1-1ubuntu1.10+esm1, released September 27, 2023. It is not reported as exploited. Patch Radar priority: Urgent.
Exim SMTP Challenge Stack-based Buffer Overflow Remote Code Execution Vulnerability. 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 handling of NTLM challenge requests. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a fixed-length stack-based buffer. An attacker can leverage this vulnerability to execute code in the context of the service account. . Was ZDI-CAN-17515.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| exim4 · Debian 12.15 (bookworm) | 4.96-15+deb12u2 | DEBIAN-CVE-2023-42116 | May 3, 2024 |
| exim4 · Debian 13.5 (trixie) | 4.97~RC1-2 | DEBIAN-CVE-2023-42116 | May 3, 2024 |
| exim4 · Debian 14 | 4.97~RC1-2 | DEBIAN-CVE-2023-42116 | May 3, 2024 |
| exim4 · Ubuntu 18.04.6 LTS (bionic) | 4.90.1-1ubuntu1.10+esm1 | exim4 4.90.1-1ubuntu1.10+esm1 | Sep 27, 2023 |
| exim4 · Ubuntu 20.04 LTS (focal) | 4.93-13ubuntu1.8 | exim4 4.93-13ubuntu1.8 | Sep 27, 2023 |
| exim4 · Ubuntu 22.04.1 LTS (jammy) | 4.95-4ubuntu2.3 | exim4 4.95-4ubuntu2.3 | Sep 27, 2023 |
| exim4-base · Ubuntu 18.04.6 LTS (bionic) | 4.90.1-1ubuntu1.10+esm1 | exim4-base 4.90.1-1ubuntu1.10+esm1 | Sep 27, 2023 |
| exim4-base · Ubuntu 20.04 LTS (focal) | 4.93-13ubuntu1.8 | exim4-base 4.93-13ubuntu1.8 | Sep 27, 2023 |
| exim4-base · Ubuntu 22.04.1 LTS (jammy) | 4.95-4ubuntu2.3 | exim4-base 4.95-4ubuntu2.3 | Sep 27, 2023 |
| exim4-config · Ubuntu 18.04.6 LTS (bionic) | 4.90.1-1ubuntu1.10+esm1 | exim4-config 4.90.1-1ubuntu1.10+esm1 | Sep 27, 2023 |
| exim4-config · Ubuntu 20.04 LTS (focal) | 4.93-13ubuntu1.8 | exim4-config 4.93-13ubuntu1.8 | Sep 27, 2023 |
| exim4-config · Ubuntu 22.04.1 LTS (jammy) | 4.95-4ubuntu2.3 | exim4-config 4.95-4ubuntu2.3 | Sep 27, 2023 |
| exim4-daemon-heavy · Ubuntu 18.04.6 LTS (bionic) | 4.90.1-1ubuntu1.10+esm1 | exim4-daemon-heavy 4.90.1-1ubuntu1.10+esm1 | Sep 27, 2023 |
| exim4-daemon-heavy · Ubuntu 20.04 LTS (focal) | 4.93-13ubuntu1.8 | exim4-daemon-heavy 4.93-13ubuntu1.8 | Sep 27, 2023 |
| exim4-daemon-heavy · Ubuntu 22.04.1 LTS (jammy) | 4.95-4ubuntu2.3 | exim4-daemon-heavy 4.95-4ubuntu2.3 | Sep 27, 2023 |
| exim4-daemon-light · Ubuntu 18.04.6 LTS (bionic) | 4.90.1-1ubuntu1.10+esm1 | exim4-daemon-light 4.90.1-1ubuntu1.10+esm1 | Sep 27, 2023 |
| exim4-daemon-light · Ubuntu 20.04 LTS (focal) | 4.93-13ubuntu1.8 | exim4-daemon-light 4.93-13ubuntu1.8 | Sep 27, 2023 |
| exim4-daemon-light · Ubuntu 22.04.1 LTS (jammy) | 4.95-4ubuntu2.3 | exim4-daemon-light 4.95-4ubuntu2.3 | Sep 27, 2023 |
| eximon4 · Ubuntu 18.04.6 LTS (bionic) | 4.90.1-1ubuntu1.10+esm1 | eximon4 4.90.1-1ubuntu1.10+esm1 | Sep 27, 2023 |
| eximon4 · Ubuntu 20.04 LTS (focal) | 4.93-13ubuntu1.8 | eximon4 4.93-13ubuntu1.8 | Sep 27, 2023 |
| eximon4 · Ubuntu 22.04.1 LTS (jammy) | 4.95-4ubuntu2.3 | eximon4 4.95-4ubuntu2.3 | Sep 27, 2023 |
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