The ClamAV AntiVirus software versions 0.99.2 and prior contain a vulnerability that could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. The vulnerability is due to a lack of input validation checking mechanisms during certain mail parsing functions (the rfc2047 function in mbox.c). An unauthenticated, remote attacker could exploit this vulnerability by sending a crafted email to the affected device. This action could cause a buffer overflow condition when ClamAV scans the malicious email, allowing the attacker to potentially cause a DoS condition on an affected device.
The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.
| Link | Tags |
|---|---|
| https://usn.ubuntu.com/3550-1/ | vendor advisory |
| https://usn.ubuntu.com/3550-2/ | vendor advisory |
| https://lists.debian.org/debian-lts-announce/2018/01/msg00035.html | third party advisory mailing list |
| https://bugzilla.clamav.net/show_bug.cgi?id=11940 | issue tracking patch vendor advisory exploit |
| http://blog.clamav.net/2018/01/clamav-0993-has-been-released.html | release notes vendor advisory |