CVE-2019-9506

NameCVE-2019-9506
DescriptionThe Bluetooth BR/EDR specification up to and including version 5.1 permits sufficiently low encryption key length and does not prevent an attacker from influencing the key length negotiation. This allows practical brute-force attacks (aka "KNOB") that can decrypt traffic and inject arbitrary ciphertext without the victim noticing.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub code/issues, web search, more)
ReferencesDLA-1919-1
NVD severitymedium (attack range: remote)

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
linux (PTS)jessie3.16.56-1+deb8u1vulnerable
jessie (security)3.16.72-1vulnerable
stretch4.9.189-3fixed
stretch (security)4.9.168-1+deb9u5vulnerable
buster4.19.67-2fixed
buster (security)4.19.37-5+deb10u2vulnerable
bullseye, sid5.2.9-2fixed
linux-4.9 (PTS)jessie (security)4.9.189-3~deb8u1fixed

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
linuxsource(unstable)5.2.6-1medium
linuxsourcebuster4.19.67-1medium
linuxsourcestretch4.9.185-1medium
linux-4.9sourcejessie4.9.189-3~deb8u1mediumDLA-1919-1

Notes

Hardware issue, but mitigation in Linux kernel can be applied:
https://git.kernel.org/linus/d5bb334a8e171b262e48f378bd2096c0ea458265 (5.2-rc1)
https://git.kernel.org/linus/693cd8ce3f882524a5d06f7800dd8492411877b3 (5.2-rc6)
https://git.kernel.org/linus/eca94432934fe5f141d084f2e36ee2c0e614cc04 (5.2)

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