Vulnerability in Bluez
CVE-2019-8921
An issue was discovered in bluetoothd in BlueZ through 5.48. The vulnerability lies in the handling of a SVC_ATTR_REQ by the SDP implementation. By crafting a malicious CSTATE, it is possible to trick the server into returning more bytes than the buffer actually holds, resulting in leaking arbitrary heap data. The root cause can be found in the function service_attr_req of sdpd-request.c. The server does not check whether the CSTATE data is the same in consecutive requests, and instead simply trusts that it is the same.
EPSS: 0.009 (57.2th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.
Affected products
- Bluez
- Linux Linux_kernel
- Debian Debian_linux — versions 10.0
- N/a — versions n/a
Weakness classification (CWE)
References
- cve@mitre.org (Exploit, Patch, Third Party Advisory)
- cve@mitre.org (Third Party Advisory)
- cve@mitre.org (mailing-list, Mailing List, Third Party Advisory)
Frequently asked questions
- What is CVE-2019-8921?
- CVE-2019-8921 is a medium-severity vulnerability in Bluez, classified under Insufficient Verification of Data Authenticity. CVSS score: 6.5/10. Published 2021-11-29.
- How severe is CVE-2019-8921?
- Medium severity. CVSS v3 base score is 6.5 out of 10.