An issue was discovered in BusyBox through 1.30.0. An out of bounds read in udhcp components (consumed by the DHCP server, client, and/or relay) might allow a remote attacker to leak sensitive information from the stack by sending a crafted DHCP message. This is related to assurance of a 4-byte length when decoding DHCP_SUBNET. NOTE: this issue exists because of an incomplete fix for CVE-2018-20679.
The MITRE CVE dictionary describes this issue as:
Find out more about CVE-2019-5747 from the MITRE CVE dictionary dictionary and NIST NVD.
This issue did not affect the versions of busybox as shipped with Red Hat Enterprise Linux 5 and 6.
NOTE: The following CVSS v3 metrics and score provided are preliminary and subject to review.
| CVSS3 Base Score | 3.5 |
|---|---|
| CVSS3 Base Metrics | CVSS:3.0/AV:A/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N |
| Attack Vector | Adjacent Network |
| Attack Complexity | Low |
| Privileges Required | None |
| User Interaction | Required |
| Scope | Unchanged |
| Confidentiality | Low |
| Integrity Impact | None |
| Availability Impact | None |
| Platform | Package | State |
|---|---|---|
| Red Hat Enterprise Linux 6 | busybox | Not affected |
| Red Hat Enterprise Linux 5 | busybox | Not affected |
Vulmon