Threats Tagged 'cve-2024-23185'

Two vulnerabilities in Dovecot, an IMAP and POP3 server, can lead to denial of service or resource exhaustion. CVE-2024-23184 involves triggering a denial of service by using a large number of address headers. CVE-2024-23185 involves resource exhaustion caused by very large headers during message parsing. These issues affect Red Hat Enterprise Linux 8 and related builds. A security update addressing these vulnerabilities is available from Red Hat.

Very large headers can cause resource exhaustion when parsing message. The message-parser normally reads reasonably sized chunks of the message. However, when it feeds them to message-header-parser, it starts building up "full_value" buffer out of the smaller chunks. The full_value buffer has no size limit, so large headers can cause large memory usage. It doesn't matter whether it's a single long header line, or a single header split into multiple lines. This bug exists in all Dovecot versions. Incoming mails typically have some size limits set by MTA, so even largest possible header size may still fit into Dovecot's vsz_limit. So attackers probably can't DoS a victim user this way. A user could APPEND larger mails though, allowing them to DoS themselves (although maybe cause some memory issues for the backend in general). One can implement restrictions on headers on MTA component preceding Dovecot. No publicly available exploits are known.

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Two vulnerabilities in Dovecot, an IMAP and POP3 server, can lead to denial of service or resource exhaustion. CVE-2024-23184 involves triggering denial of service by using a large number of address headers. CVE-2024-23185 involves resource exhaustion caused by very large headers during message parsing. These issues affect Red Hat Enterprise Linux 9 and related variants. A security update addressing these vulnerabilities is available from Red Hat.

Two vulnerabilities in Dovecot, an IMAP and POP3 server, can lead to denial of service or resource exhaustion. CVE-2024-23184 involves triggering a denial of service by using a large number of address headers. CVE-2024-23185 involves resource exhaustion caused by very large headers during message parsing. Red Hat has released security updates addressing these issues in Red Hat Enterprise Linux 9.2 Extended Update Support and related variants.