Out-of-bounds Read in Busybox
CVE-2018-20679
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.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.077 (94.5th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 95th percentile — 94.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.075 · newest: 0.077 · change: +0.002
Affected products
- Busybox
- Canonical Ubuntu Linux — versions 14.04, 16.04, 18.04
Weakness classification (CWE)
Public proof-of-concept exploits
References
- git.busybox.net/busybox/commit/ (Patch, Third Party Advisory)
- busybox.net/news.html (Third Party Advisory, Release Notes)
- bugs.busybox.net/show_bug.cgi (Exploit, Third Party Advisory, Issue Tracking)
- usn.ubuntu.com/3935-1/ (vendor-advisory, Third Party Advisory)
- seclists.org/fulldisclosure/2019/Sep/7 (mailing-list)
- seclists.org/bugtraq/2019/Sep/7 (mailing-list)
- packetstormsecurity.com/files/154361/Cisco-Device-Hardcoded-Credentials-GNU-gli…
Frequently asked questions
- What is CVE-2018-20679?
- CVE-2018-20679 is a high-severity vulnerability in Busybox, classified under Out-of-bounds Read. CVSS score: 7.5/10. Published 2019-01-09.
- How severe is CVE-2018-20679?
- High severity. CVSS v3 base score is 7.5 out of 10.
- Is CVE-2018-20679 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.