CVE-2023-42119
Exim dnsdb Out-Of-Bounds Read Information Disclosure Vulnerability
In short
Exim's dnsdb feature has a flaw where it reads beyond allowed memory boundaries, potentially exposing sensitive information. An unauthenticated attacker on the network can trigger this issue through the SMTP service.
Technical detail
A buffer over-read vulnerability exists in Exim's dnsdb functionality reachable via the SMTP service (TCP 25). Lack of input validation allows network-adjacent attackers without authentication to read past allocated buffer boundaries, disclosing sensitive memory contents that could facilitate further exploitation.
Summary generated and translated by AI from the official description.
Exim dnsdb Out-Of-Bounds Read Information Disclosure Vulnerability. This vulnerability allows network-adjacent attackers to disclose sensitive information 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 read past the end of an allocated buffer. An attacker can leverage this in conjunction with other vulnerabilities to execute arbitrary code in the context of the service account.
. Was ZDI-CAN-17643.
CVSS:3.0/AV:A/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
Affected products
Exim · EximWant to know if your infrastructure is exposed to this?
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