CVE-2017-1000410

high
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Description

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).

References

http://seclists.org/oss-sec/2017/q4/357

http://www.securityfocus.com/bid/102101

https://access.redhat.com/errata/RHSA-2018:0654

https://access.redhat.com/errata/RHSA-2018:0676

https://access.redhat.com/errata/RHSA-2018:1062

https://access.redhat.com/errata/RHSA-2018:1130

https://access.redhat.com/errata/RHSA-2018:1170

https://access.redhat.com/errata/RHSA-2018:1319

https://help.ecostruxureit.com/display/public/UADCE725/Security+fixes+in+StruxureWare+Data+Center+Expert+v7.6.0

https://usn.ubuntu.com/3933-1/

https://usn.ubuntu.com/3933-2/

https://www.debian.org/security/2017/dsa-4073

https://www.debian.org/security/2018/dsa-4082

Details

Source: MITRE

Published: 2017-12-07

Updated: 2019-04-08

Type: CWE-200

Risk Information

CVSS v2

Base Score: 5

Vector: AV:N/AC:L/Au:N/C:P/I:N/A:N

Impact Score: 2.9

Exploitability Score: 10

Severity: MEDIUM

CVSS v3

Base Score: 7.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Impact Score: 3.6

Exploitability Score: 3.9

Severity: HIGH

Tenable Plugins

View all (32 total)

IDNameProductFamilySeverity
127281NewStart CGSL CORE 5.04 / MAIN 5.04 : kernel-rt Multiple Vulnerabilities (NS-SA-2019-0074)NessusNewStart CGSL Local Security Checks
critical
127272NewStart CGSL CORE 5.04 / MAIN 5.04 : kernel Multiple Vulnerabilities (NS-SA-2019-0070)NessusNewStart CGSL Local Security Checks
critical
124821EulerOS Virtualization 3.0.1.0 : kernel (EulerOS-SA-2019-1498)NessusHuawei Local Security Checks
high
124808EulerOS Virtualization for ARM 64 3.0.1.0 : kernel (EulerOS-SA-2019-1484)NessusHuawei Local Security Checks
critical
123682Ubuntu 14.04 LTS : linux vulnerabilities (USN-3933-1)NessusUbuntu Local Security Checks
high
111022OracleVM 3.3 : Unbreakable / etc (OVMSA-2018-0237)NessusOracleVM Local Security Checks
high
110998Oracle Linux 6 / 7 : Unbreakable Enterprise kernel (ELSA-2018-4164)NessusOracle Linux Local Security Checks
high
110583Oracle Linux 6 / 7 : Unbreakable Enterprise kernel (ELSA-2018-4134)NessusOracle Linux Local Security Checks
high
110581OracleVM 3.3 : Unbreakable / etc (OVMSA-2018-0231)NessusOracleVM Local Security Checks
high
110072OracleVM 3.4 : Unbreakable / etc (OVMSA-2018-0223) (Spectre)NessusOracleVM Local Security Checks
high
110071Oracle Linux 6 / 7 : Unbreakable Enterprise kernel (ELSA-2018-4114) (Spectre)NessusOracle Linux Local Security Checks
high
109801Virtuozzo 6 : parallels-server-bm-release / vzkernel / etc (VZA-2018-029)NessusVirtuozzo Local Security Checks
high
109655CentOS 6 : kernel (CESA-2018:1319) (Meltdown)NessusCentOS Local Security Checks
critical
109643Scientific Linux Security Update : kernel on SL6.x i386/x86_64 (20180508) (Meltdown)NessusScientific Linux Local Security Checks
critical
109634RHEL 6 : kernel (RHSA-2018:1319) (Meltdown)NessusRed Hat Local Security Checks
critical
109629Oracle Linux 6 : kernel (ELSA-2018-1319) (Meltdown)NessusOracle Linux Local Security Checks
critical
109449Scientific Linux Security Update : kernel on SL7.x x86_64 (20180410) (Meltdown)NessusScientific Linux Local Security Checks
critical
109380CentOS 7 : kernel (CESA-2018:1062)NessusCentOS Local Security Checks
critical
109335RHEL 6 : MRG (RHSA-2018:1170)NessusRed Hat Local Security Checks
critical
109116RHEL 7 : kernel (RHSA-2018:1130)NessusRed Hat Local Security Checks
critical
109113Oracle Linux 7 : kernel (ELSA-2018-1062)NessusOracle Linux Local Security Checks
critical
108997RHEL 7 : kernel (RHSA-2018:1062)NessusRed Hat Local Security Checks
critical
108984RHEL 7 : kernel-rt (RHSA-2018:0676)NessusRed Hat Local Security Checks
critical
108942RHEL 7 : kernel-alt (RHSA-2018:0654)NessusRed Hat Local Security Checks
high
105704Debian DSA-4082-1 : linux - security update (Meltdown)NessusDebian Local Security Checks
high
105461SUSE SLED12 / SLES12 Security Update : kernel (SUSE-SU-2017:3410-1)NessusSuSE Local Security Checks
high
105460SUSE SLED12 / SLES12 Security Update : kernel (SUSE-SU-2017:3398-1)NessusSuSE Local Security Checks
high
105433Debian DSA-4073-1 : linux - security updateNessusDebian Local Security Checks
high
105364openSUSE Security Update : the Linux Kernel (openSUSE-2017-1391) (Dirty COW)NessusSuSE Local Security Checks
high
105344openSUSE Security Update : the Linux Kernel (openSUSE-2017-1390) (Dirty COW)NessusSuSE Local Security Checks
high
105047EulerOS 2.0 SP2 : kernel (EulerOS-SA-2017-1319)NessusHuawei Local Security Checks
medium
105046EulerOS 2.0 SP1 : kernel (EulerOS-SA-2017-1318)NessusHuawei Local Security Checks
high