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CVE-2017-1000410

Published: 7 December 2017

The Linux kernel version 3.3-rc1 and later is affected by a vulnerability lies in the processing of incoming L2CAP commands - ConfigRequest, and ConfigResponse messages. This info leak is a result of uninitialized stack variables that may be returned to an attacker in their uninitialized state. By manipulating the code flows that precede the handling of these configuration messages, an attacker can also gain some control over which data will be held in the uninitialized stack variables. This can allow him to bypass KASLR, and stack canaries protection - as both pointers and stack canaries may be leaked in this manner. Combining this vulnerability (for example) with the previously disclosed RCE vulnerability in L2CAP configuration parsing (CVE-2017-1000251) may allow an attacker to exploit the RCE against kernels which were built with the above mitigations. These are the specifics of this vulnerability: In the function l2cap_parse_conf_rsp and in the function l2cap_parse_conf_req the following variable is declared without initialization: struct l2cap_conf_efs efs; In addition, when parsing input configuration parameters in both of these functions, the switch case for handling EFS elements may skip the memcpy call that will write to the efs variable: ... case L2CAP_CONF_EFS: if (olen == sizeof(efs)) memcpy(&efs, (void *)val, olen); ... The olen in the above if is attacker controlled, and regardless of that if, in both of these functions the efs variable would eventually be added to the outgoing configuration request that is being built: l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, sizeof(efs), (unsigned long) &efs); So by sending a configuration request, or response, that contains an L2CAP_CONF_EFS element, but with an element length that is not sizeof(efs) - the memcpy to the uninitialized efs variable can be avoided, and the uninitialized variable would be returned to the attacker (16 bytes).

From the Ubuntu Security Team

It was discovered that an information leak vulnerability existed in the Bluetooth implementation of the Linux kernel. An attacker within Bluetooth range could possibly expose sensitive information (kernel memory).

Priority

Low

Cvss 3 Severity Score

7.5

Score breakdown

Status

Package Release Status
linux
Launchpad, Ubuntu, Debian
artful Not vulnerable
(4.13.0-11.12)
cosmic Not vulnerable
(4.15.0-20.21)
trusty
Released (3.13.0-168.218)
xenial
Released (4.4.0-119.143)
zesty
Released (4.10.0-35.39)
bionic Not vulnerable
(4.15.0-10.11)
upstream
Released (4.15~rc8)
Patches:
Introduced by

42dceae2819b5ac6fc9a0d414ae05a8960e2a1d9

Fixed by 06e7e776ca4d36547e503279aeff996cbb292c16
Introduced by

66af7aaf9edff55b7995bbe1ff508513666d0671

Fixed by 06e7e776ca4d36547e503279aeff996cbb292c16
linux-aws
Launchpad, Ubuntu, Debian
artful Does not exist

cosmic Not vulnerable
(4.15.0-1007.7)
trusty
Released (4.4.0-1016.16)
xenial
Released (4.4.0-1054.63)
zesty Does not exist

bionic Not vulnerable
(4.15.0-1001.1)
upstream
Released (4.15~rc8)
linux-aws-hwe
Launchpad, Ubuntu, Debian
cosmic Does not exist

trusty Does not exist

xenial Not vulnerable
(4.15.0-1030.31~16.04.1)
bionic Does not exist

upstream
Released (4.15~rc8)
linux-azure
Launchpad, Ubuntu, Debian
artful Does not exist

cosmic Not vulnerable
(4.15.0-1009.9)
trusty Not vulnerable
(4.15.0-1023.24~14.04.1)
xenial
Released (4.15.0-1013.13~16.04.2)
zesty Does not exist

bionic Not vulnerable
(4.15.0-1002.2)
upstream
Released (4.15~rc8)
linux-azure-edge
Launchpad, Ubuntu, Debian
cosmic Does not exist

trusty Does not exist

xenial
Released (4.15.0-1013.13~16.04.2)
bionic Not vulnerable
(4.15.0-1002.2)
upstream
Released (4.15~rc8)
linux-flo
Launchpad, Ubuntu, Debian
artful Does not exist

cosmic Does not exist

trusty Does not exist
(trusty was ignored [abandoned])
xenial Ignored
(abandoned)
zesty Does not exist

bionic Does not exist

upstream
Released (4.15~rc8)
linux-gcp
Launchpad, Ubuntu, Debian
artful Does not exist

cosmic Not vulnerable
(4.15.0-1006.6)
trusty Does not exist

xenial
Released (4.15.0-1014.14~16.04.1)
zesty Does not exist

bionic Not vulnerable
(4.15.0-1001.1)
upstream
Released (4.15~rc8)
linux-gcp-edge
Launchpad, Ubuntu, Debian
cosmic Does not exist

trusty Does not exist

xenial Does not exist

bionic Not vulnerable
(4.18.0-1004.5~18.04.1)
upstream
Released (4.15~rc8)
linux-gke
Launchpad, Ubuntu, Debian
artful Does not exist

cosmic Does not exist

trusty Does not exist

xenial
Released (4.4.0-1031.31)
zesty Does not exist

bionic Does not exist

upstream
Released (4.15~rc8)
linux-goldfish
Launchpad, Ubuntu, Debian
artful Does not exist

cosmic Does not exist

trusty Does not exist
(trusty was ignored [abandoned])
xenial Ignored
(end of life, was needed)
zesty Ignored
(end of life)
bionic Does not exist

upstream
Released (4.15~rc8)
linux-grouper
Launchpad, Ubuntu, Debian
xenial Does not exist

zesty Does not exist

bionic Does not exist

upstream
Released (4.15~rc8)
artful Does not exist

cosmic Does not exist

trusty Does not exist
(trusty was ignored [abandoned])
linux-hwe
Launchpad, Ubuntu, Debian
artful Does not exist

cosmic Does not exist

trusty Does not exist

xenial
Released (4.15.0-24.26~16.04.1)
zesty Does not exist

bionic Not vulnerable
(4.18.0-13.14~18.04.1)
upstream
Released (4.15~rc8)
linux-hwe-edge
Launchpad, Ubuntu, Debian
artful Does not exist

cosmic Does not exist

trusty Does not exist

xenial
Released (4.15.0-24.26~16.04.1)
zesty Does not exist

bionic Not vulnerable
(5.0.0-8.9~18.04.1)
upstream
Released (4.15~rc8)
linux-kvm
Launchpad, Ubuntu, Debian
artful Does not exist

cosmic Not vulnerable
(4.15.0-1008.8)
trusty Does not exist

xenial
Released (4.4.0-1020.25)
zesty Does not exist

bionic Not vulnerable
(4.15.0-1002.2)
upstream
Released (4.15~rc8)
linux-linaro-omap
Launchpad, Ubuntu, Debian
artful Does not exist

cosmic Does not exist

trusty Does not exist

xenial Does not exist

zesty Does not exist

bionic Does not exist

upstream
Released (4.15~rc8)
linux-linaro-shared
Launchpad, Ubuntu, Debian
artful Does not exist

cosmic Does not exist

trusty Does not exist

xenial Does not exist

zesty Does not exist

bionic Does not exist

upstream
Released (4.15~rc8)
linux-linaro-vexpress
Launchpad, Ubuntu, Debian
artful Does not exist

cosmic Does not exist

trusty Does not exist

xenial Does not exist

zesty Does not exist

bionic Does not exist

upstream
Released (4.15~rc8)
linux-lts-quantal
Launchpad, Ubuntu, Debian
artful Does not exist

cosmic Does not exist

trusty Does not exist

xenial Does not exist

zesty Does not exist

bionic Does not exist

upstream
Released (4.15~rc8)
This package is not directly supported by the Ubuntu Security Team
linux-lts-raring
Launchpad, Ubuntu, Debian
artful Does not exist

cosmic Does not exist

trusty Does not exist

xenial Does not exist

zesty Does not exist

upstream
Released (4.15~rc8)
bionic Does not exist

linux-lts-saucy
Launchpad, Ubuntu, Debian
artful Does not exist

cosmic Does not exist

trusty Does not exist

xenial Does not exist

zesty Does not exist

bionic Does not exist

upstream
Released (4.15~rc8)
This package is not directly supported by the Ubuntu Security Team
linux-lts-trusty
Launchpad, Ubuntu, Debian
artful Does not exist

cosmic Does not exist

trusty Does not exist

xenial Does not exist

zesty Does not exist

bionic Does not exist

upstream
Released (4.15~rc8)
linux-lts-utopic
Launchpad, Ubuntu, Debian
artful Does not exist

cosmic Does not exist

trusty Does not exist
(trusty was ignored [end of standard support])
xenial Does not exist

zesty Does not exist

bionic Does not exist

upstream
Released (4.15~rc8)
linux-lts-vivid
Launchpad, Ubuntu, Debian
artful Does not exist

cosmic Does not exist

trusty Ignored
(end of life, was needs-triage)
xenial Does not exist

zesty Does not exist

upstream
Released (4.15~rc8)
bionic Does not exist

linux-lts-wily
Launchpad, Ubuntu, Debian
artful Does not exist

cosmic Does not exist

trusty Does not exist
(trusty was ignored [end of standard support])
xenial Does not exist

zesty Does not exist

bionic Does not exist

upstream
Released (4.15~rc8)
linux-lts-xenial
Launchpad, Ubuntu, Debian
artful Does not exist

cosmic Does not exist

trusty
Released (4.4.0-119.143~14.04.1)
xenial Does not exist

zesty Does not exist

bionic Does not exist

upstream
Released (4.15~rc8)
linux-maguro
Launchpad, Ubuntu, Debian
artful Does not exist

cosmic Does not exist

trusty Does not exist
(trusty was ignored [abandoned])
xenial Does not exist

zesty Does not exist

bionic Does not exist

upstream
Released (4.15~rc8)
linux-mako
Launchpad, Ubuntu, Debian
artful Does not exist

cosmic Does not exist

trusty Does not exist
(trusty was ignored [abandoned])
xenial Ignored
(abandoned)
zesty Does not exist

bionic Does not exist

upstream
Released (4.15~rc8)
linux-manta
Launchpad, Ubuntu, Debian
artful Does not exist

cosmic Does not exist

trusty Does not exist
(trusty was ignored [abandoned])
xenial Does not exist

zesty Does not exist

bionic Does not exist

upstream
Released (4.15~rc8)
linux-oracle
Launchpad, Ubuntu, Debian
cosmic Not vulnerable

trusty Does not exist

xenial Not vulnerable
(4.15.0-1007.9~16.04.1)
bionic Not vulnerable
(4.15.0-1007.9)
upstream
Released (4.15~rc8)
linux-qcm-msm
Launchpad, Ubuntu, Debian
artful Does not exist

cosmic Does not exist

trusty Does not exist

xenial Does not exist

zesty Does not exist

bionic Does not exist

upstream
Released (4.15~rc8)
linux-raspi2
Launchpad, Ubuntu, Debian
artful Not vulnerable
(4.10.0-1018.21)
cosmic Not vulnerable
(4.15.0-1010.11)
trusty Does not exist

xenial
Released (4.4.0-1086.94)
zesty
Released (4.10.0-1018.21)
bionic Not vulnerable
(4.15.0-1006.7)
upstream
Released (4.15~rc8)
linux-snapdragon
Launchpad, Ubuntu, Debian
artful Not vulnerable
(4.4.0-1076.81)
cosmic Does not exist

trusty Does not exist

xenial
Released (4.4.0-1088.93)
zesty
Released (4.4.0-1076.81)
bionic Not vulnerable

upstream
Released (4.15~rc8)
linux-ti-omap4
Launchpad, Ubuntu, Debian
artful Does not exist

cosmic Does not exist

trusty Does not exist

xenial Does not exist

zesty Does not exist

bionic Does not exist

upstream
Released (4.15~rc8)
linux-armadaxp
Launchpad, Ubuntu, Debian
bionic Does not exist

upstream
Released (4.15~rc8)
artful Does not exist

cosmic Does not exist

trusty Does not exist

xenial Does not exist

zesty Does not exist

This package is not directly supported by the Ubuntu Security Team
linux-euclid
Launchpad, Ubuntu, Debian
upstream
Released (4.15~rc8)
bionic Does not exist

artful Does not exist

cosmic Does not exist

trusty Does not exist

xenial Ignored
(was needs-triage ESM criteria)
zesty Does not exist

linux-oem
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(4.15.0-1002.3)
upstream
Released (4.15~rc8)
artful Does not exist

cosmic Not vulnerable
(4.15.0-1004.5)
trusty Does not exist

xenial Not vulnerable
(4.13.0-1008.9)
zesty Does not exist

Severity score breakdown

Parameter Value
Base score 7.5
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality High
Integrity impact None
Availability impact None
Vector CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N