CVE-2018-20679
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.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (7.69%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a 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.
- CVSS 3.1
- 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
- EPSS
- 7.69% probability · 94th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-125
- Affected
- busybox/busybox · canonical/ubuntu linux
- Source
- cve@mitre.org
References
- http://packetstormsecurity.com/files/154361/Cisco-Device-Hardcoded-Credentials-GNU-glibc-BusyBox.html
- http://seclists.org/fulldisclosure/2019/Sep/7
- https://bugs.busybox.net/show_bug.cgi?id=11506Exploit, Issue Tracking, Third Party Advisory
- https://busybox.net/news.htmlRelease Notes, Third Party Advisory
- https://git.busybox.net/busybox/commit/?id=6d3b4bb24da9a07c263f3c1acf8df85382ff562cPatch, Third Party Advisory
- https://seclists.org/bugtraq/2019/Sep/7
- https://usn.ubuntu.com/3935-1/Third Party Advisory
- http://packetstormsecurity.com/files/154361/Cisco-Device-Hardcoded-Credentials-GNU-glibc-BusyBox.html
- http://seclists.org/fulldisclosure/2019/Sep/7
- https://bugs.busybox.net/show_bug.cgi?id=11506Exploit, Issue Tracking, Third Party Advisory
- https://busybox.net/news.htmlRelease Notes, Third Party Advisory
- https://git.busybox.net/busybox/commit/?id=6d3b4bb24da9a07c263f3c1acf8df85382ff562cPatch, Third Party Advisory
- https://seclists.org/bugtraq/2019/Sep/7
- https://usn.ubuntu.com/3935-1/Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.