The vulnerability in Exim could allow an attacker to remotely execute code with root privileges.
Exim, the mail transfer agent used by more than half the email servers on the Internet, has a vulnerability. The flaw, found in versions from 4.80 through 4.92.1, allows a malicious actor to use an encrypted TLS connection to remotely execute code with root privileges.
The vulnerability, designated CVE-2019-15846, was discovered by researcher Zerons in late July. It takes advantage of the TLS ServerName Indicator (SNI), a feature that allows TLS to serve different certificates for various websites on a single server. A buffer overflow triggered by a relatively simple SNI request followed by a counterfeit client certificate are enough to exploit the vulnerability.
Responsible disclosure procedures were followed and a patch for the vulnerability has been made available in Exim 4.92.2.
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