Very High
Exim Unauthenticated Remote Code Execution via SNI Trailing Backslash
CVE ID
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Very High
(2 users assessed)
Very High
(2 users assessed)Unknown
Unknown
Unknown
Exim Unauthenticated Remote Code Execution via SNI Trailing Backslash
MITRE ATT&CK
Collection
Command and Control
Credential Access
Defense Evasion
Discovery
Execution
Exfiltration
Impact
Initial Access
Lateral Movement
Persistence
Privilege Escalation
Topic Tags
Description
Exim before 4.92.2 allows remote attackers to execute arbitrary code as root via a trailing backslash. If the Exim server accepts TLS connections, the vulnerability is exploitable by sending a SNI ending in a backslash-null sequence during the initial TLS handshake.
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Ratings
-
Attacker ValueVery High
Technical Analysis
Exim is run on approximately 57% of the publicly reachable mail servers on the Internet, based on an August 2019 study performed by E-Soft, Inc. 1
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Ratings
-
Attacker ValueVery High
-
ExploitabilityVery High
Technical Analysis
Due to public exploits being available : https://github.com/synacktiv/Exim-CVE-2019-15846, and the fact that Exim is installed on a large number of mail servers, the value to an attacker lies in the fact that this requires no authentication.
There is a deeper explanation of the vulnerability here: https://www.synacktiv.com/posts/exploit/scraps-of-notes-on-exploiting-exim-vulnerabilities.html
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References
Additional Info
Technical Analysis
Report as Emergent Threat Response
Report as Exploited in the Wild
CVE ID
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