FreeBSD VuXML: Documenting security issues in FreeBSD and the FreeBSD Ports Collection

Exim -- RCE with root privileges in TLS SNI handler

Affected packages
		exim	<	4.92.2

Details

VuXML ID	61db9b88-d091-11e9-8d41-97657151f8c2
Discovery	2019-09-02
Entry	2019-09-06

Exim developers report:

If your Exim server accepts TLS connections, it is vulnerable. This does not depend on the TLS libray, so both, GnuTLS and OpenSSL are affected.

The vulnerability is exploitable by sending a SNI ending in a backslash-null sequence during the initial TLS handshake. The exploit exists as a POC. For more details see the document qualys.mbx

[source]

References

URL	https://git.exim.org/exim.git/blob_plain/2600301ba6dbac5c9d640c87007a07ee6dcea1f4:/doc/doc-txt/cve-2019-15846/cve.txt