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CVE-2018-20679

Published: 9 January 2019

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.

Notes

AuthorNote
mdeslaur
this fix is incomplete, see CVE-2019-5747

Priority

Low

Cvss 3 Severity Score

7.5

Score breakdown

Status

Package Release Status
busybox
Launchpad, Ubuntu, Debian
hirsute
Released (1:1.27.2-2ubuntu5)
bionic
Released (1:1.27.2-2ubuntu3.2)
cosmic
Released (1:1.27.2-2ubuntu4.1)
disco
Released (1:1.27.2-2ubuntu5)
eoan
Released (1:1.27.2-2ubuntu5)
focal
Released (1:1.27.2-2ubuntu5)
groovy
Released (1:1.27.2-2ubuntu5)
trusty
Released (1:1.21.0-1ubuntu1.4)
upstream
Released (1:1.30.1-2)
xenial
Released (1:1.22.0-15ubuntu1.4)
Patches:
upstream: https://git.busybox.net/busybox/commit/?id=6d3b4bb24da9a07c263f3c1acf8df85382ff562c

Severity score breakdown

Parameter Value
Base score 7.5
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality High
Integrity impact None
Availability impact None
Vector CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N