{"id":"UBUNTU-CVE-2023-42118","details":"Exim libspf2 Integer Underflow Remote Code Execution Vulnerability. This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of Exim libspf2. Authentication is not required to exploit this vulnerability. The specific flaw exists within the parsing of SPF macros. When parsing SPF macros, the process does not properly validate user-supplied data, which can result in an integer underflow before writing to memory. An attacker can leverage this vulnerability to execute code in the context of the service account. . Was ZDI-CAN-17578.","modified":"2026-07-22T20:46:40.092910271Z","published":"2024-05-03T03:15:00Z","upstream":["CVE-2023-42118"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2023-42118"},{"type":"REPORT","url":"https://www.zerodayinitiative.com/advisories/ZDI-23-1472/"},{"type":"REPORT","url":"https://exim.org/static/doc/security/CVE-2023-zdi.txt"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2023-42118"}],"affected":[{"package":{"name":"exim4","ecosystem":"Ubuntu:Pro:14.04:LTS","purl":"pkg:deb/ubuntu/exim4?arch=source&distro=esm-infra-legacy%2Ftrusty"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.80-7ubuntu3","4.80-7ubuntu4","4.80-9ubuntu1","4.80-9ubuntu2","4.82-3ubuntu1","4.82-3ubuntu2","4.82-3ubuntu2.1","4.82-3ubuntu2.2","4.82-3ubuntu2.3","4.82-3ubuntu2.4","4.82-3ubuntu2.4+esm1","4.82-3ubuntu2.4+esm2","4.82-3ubuntu2.4+esm3","4.82-3ubuntu2.4+esm4","4.82-3ubuntu2.4+esm6","4.82-3ubuntu2.4+esm7","4.82-3ubuntu2.4+esm8","4.82-3ubuntu2.4+esm9"],"ecosystem_specific":{"binaries":[{"binary_name":"exim4","binary_version":"4.82-3ubuntu2.4+esm9"},{"binary_version":"4.82-3ubuntu2.4+esm9","binary_name":"exim4-base"},{"binary_version":"4.82-3ubuntu2.4+esm9","binary_name":"exim4-config"},{"binary_name":"exim4-daemon-heavy","binary_version":"4.82-3ubuntu2.4+esm9"},{"binary_name":"exim4-daemon-light","binary_version":"4.82-3ubuntu2.4+esm9"},{"binary_name":"eximon4","binary_version":"4.82-3ubuntu2.4+esm9"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2023/UBUNTU-CVE-2023-42118.json"}},{"package":{"name":"exim4","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/exim4?arch=source&distro=esm-infra-legacy%2Fxenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.86-3ubuntu1","4.86-7ubuntu1","4.86-7ubuntu2","4.86-7ubuntu3","4.86.2-2ubuntu1","4.86.2-2ubuntu2","4.86.2-2ubuntu2.1","4.86.2-2ubuntu2.2","4.86.2-2ubuntu2.3","4.86.2-2ubuntu2.4","4.86.2-2ubuntu2.5","4.86.2-2ubuntu2.6","4.86.2-2ubuntu2.6+esm1","4.86.2-2ubuntu2.6+esm2","4.86.2-2ubuntu2.6+esm4","4.86.2-2ubuntu2.6+esm5","4.86.2-2ubuntu2.6+esm6","4.86.2-2ubuntu2.6+esm7","4.86.2-2ubuntu2.6+esm8","4.86.2-2ubuntu2.6+esm9"],"ecosystem_specific":{"binaries":[{"binary_version":"4.86.2-2ubuntu2.6+esm9","binary_name":"exim4"},{"binary_version":"4.86.2-2ubuntu2.6+esm9","binary_name":"exim4-base"},{"binary_version":"4.86.2-2ubuntu2.6+esm9","binary_name":"exim4-config"},{"binary_name":"exim4-daemon-heavy","binary_version":"4.86.2-2ubuntu2.6+esm9"},{"binary_name":"exim4-daemon-light","binary_version":"4.86.2-2ubuntu2.6+esm9"},{"binary_version":"4.86.2-2ubuntu2.6+esm9","binary_name":"eximon4"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2023/UBUNTU-CVE-2023-42118.json"}},{"package":{"name":"libspf2","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/libspf2?arch=source&distro=esm-apps%2Fxenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.2.10-6","1.2.10-6build1","1.2.10-6ubuntu0.1~esm1","1.2.10-6ubuntu0.1~esm2"],"ecosystem_specific":{"binaries":[{"binary_version":"1.2.10-6ubuntu0.1~esm2","binary_name":"libmail-spf-xs-perl"},{"binary_name":"libspf2-2","binary_version":"1.2.10-6ubuntu0.1~esm2"},{"binary_name":"spfquery","binary_version":"1.2.10-6ubuntu0.1~esm2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2023/UBUNTU-CVE-2023-42118.json"}},{"package":{"name":"exim4","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/exim4?arch=source&distro=esm-infra%2Fbionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.89-5ubuntu1","4.89-9ubuntu1","4.89-9ubuntu2","4.89-9ubuntu3","4.89-9ubuntu4","4.90.1-1ubuntu1","4.90.1-1ubuntu1.1","4.90.1-1ubuntu1.2","4.90.1-1ubuntu1.3","4.90.1-1ubuntu1.4","4.90.1-1ubuntu1.5","4.90.1-1ubuntu1.8","4.90.1-1ubuntu1.9","4.90.1-1ubuntu1.10","4.90.1-1ubuntu1.10+esm1","4.90.1-1ubuntu1.10+esm2","4.90.1-1ubuntu1.10+esm3","4.90.1-1ubuntu1.10+esm4","4.90.1-1ubuntu1.10+esm5","4.90.1-1ubuntu1.10+esm6"],"ecosystem_specific":{"binaries":[{"binary_version":"4.90.1-1ubuntu1.10+esm6","binary_name":"exim4"},{"binary_name":"exim4-base","binary_version":"4.90.1-1ubuntu1.10+esm6"},{"binary_name":"exim4-config","binary_version":"4.90.1-1ubuntu1.10+esm6"},{"binary_name":"exim4-daemon-heavy","binary_version":"4.90.1-1ubuntu1.10+esm6"},{"binary_name":"exim4-daemon-light","binary_version":"4.90.1-1ubuntu1.10+esm6"},{"binary_name":"eximon4","binary_version":"4.90.1-1ubuntu1.10+esm6"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2023/UBUNTU-CVE-2023-42118.json"}},{"package":{"name":"libspf2","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/libspf2?arch=source&distro=esm-apps%2Fbionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.2.10-7build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