Out of Bounds Read Vulnerability in BusyBox DHCP Components
CVE-2018-20679

7.5HIGH

Key Information:

Vendor

Busybox

Status
Busybox
Vendor
CVE Published:
9 January 2019

What is CVE-2018-20679?

A vulnerability in BusyBox prior to version 1.30.0 enables remote attackers to exploit an out of bounds read in the DHCP components (used by the DHCP server, client, and relay). By sending a specially crafted DHCP message, attackers can potentially leak sensitive data from the stack. The issue stems from insufficient verification in the function udhcp_get_option(), where it fails to ensure that 4-byte options are correctly validated before access.

References

https://git.busybox.net/busybox/commit/?id=6d3b4bb24da9a0...
x_refsource_MISC
https://busybox.net/news.html
x_refsource_MISC
https://bugs.busybox.net/show_bug.cgi?id=11506
x_refsource_MISC

EPSS Score

7% chance of being exploited in the next 30 days.

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
High
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.