CVE-2018-20679

Public Exploit

Description

An issue was discovered in BusyBox before 1.30.0. An out of bounds read in udhcp components (consumed by the DHCP server, client, and relay) allows a remote attacker to leak sensitive information from the stack by sending a crafted DHCP message. This is related to verification in udhcp_get_option() in networking/udhcp/common.c that 4-byte options are indeed 4 bytes.

Category

7.5
CVSS
Severity: High
CVSS 3.0 •
CVSS 2.0 •
EPSS 9.87% Top 10%
Vendor Advisory ubuntu.com
Affected: n/a n/a
Published at:
Updated at:

References

Link Tags
https://git.busybox.net/busybox/commit/?id=6d3b4bb24da9a07c263f3c1acf8df85382ff562c third party advisory patch
https://busybox.net/news.html third party advisory release notes
https://bugs.busybox.net/show_bug.cgi?id=11506 issue tracking exploit third party advisory
https://usn.ubuntu.com/3935-1/ third party advisory vendor advisory
http://seclists.org/fulldisclosure/2019/Sep/7 mailing list
https://seclists.org/bugtraq/2019/Sep/7 mailing list
http://packetstormsecurity.com/files/154361/Cisco-Device-Hardcoded-Credentials-GNU-glibc-BusyBox.html

Frequently Asked Questions

What is the severity of CVE-2018-20679?
CVE-2018-20679 has been scored as a high severity vulnerability.
How to fix CVE-2018-20679?
To fix CVE-2018-20679, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2018-20679 being actively exploited in the wild?
It is possible that CVE-2018-20679 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~10% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
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