Loop with Unreachable Exit Condition ('Infinite Loop')

Affecting exim4 package, versions <4.89-2+deb9u2

Overview

The receive_msg function in receive.c in the SMTP daemon in Exim 4.88 and 4.89 allows remote attackers to cause a denial of service (infinite loop and stack exhaustion) via vectors involving BDAT commands and an improper check for a '.' character signifying the end of the content, related to the bdat_getc function.

References

• CVE Details
• Debian Security Advisory
• Debian Security Tracker
• Exploit DB
• MISC
• MISC
• OSS security Advisory
• OSS security Advisory
• OSS security Advisory
• Security Tracker
• Ubuntu CVE Tracker