CVE-2017-1000410

Current 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).

Basic Data

PublishedDecember 07, 2017
Last ModifiedApril 08, 2019
Assignercve@mitre.org
Data TypeCVE
Data FormatMITRE
Data Version4.0
Problem TypeCWE-200
CVE Data Version4.0

Base Metric V2

CVSS 2 - Version2.0
CVSS 2 - Vector StringAV:N/AC:L/Au:N/C:P/I:N/A:N
CVSS 2 - Access VectorNETWORK
CVSS 2 - Access ComplexityLOW
CVSS 2 - AuthenticationNONE
CVSS 2 - Confidentiality ImpactPARTIAL
CVSS 2 - Availability ImpactNONE
CVSS 2 - Base Score5.0
SeverityMEDIUM
Exploitability Score10.0
Impact Score2.9
Obtain All Privilegefalse
Obtain User Privilegefalse
Obtain Other Privilegefalse

Base Metric V3

CVSS 3 - Version3.0
CVSS 3 - Vector StringCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CVSS 3 - Attack VectorNETWORK
CVSS 3 - Attack ComplexityLOW
CVSS 3 - Privileges RequiredNONE
CVSS 3 - User InteractionNONE
CVSS 3 - ScopeUNCHANGED
CVSS 3 - Confidentiality ImpactHIGH
CVSS 3 - Integrity ImpactNONE
CVSS 3 - Availability ImpactNONE
CVSS 3 - Base Score7.5
CVSS 3 - Base SeverityHIGH
Exploitability Score3.9
Base SeverityHIGH

Configurations

  • OR - Configuration 1
    Cpe VersionPartVendorProductVersionUpdateEditionLanguageSW EditionTarget SWTarget HWOtherVersion Start IncludingVersion End IncludingVersion Start ExcludingVersion End Excluding
    2.3OSLinuxLinux Kernel********3.24.15
    2.3OSLinuxLinux Kernel4.15rc1******
    2.3OSLinuxLinux Kernel4.15rc2******
    2.3OSLinuxLinux Kernel4.15rc3******
    2.3OSLinuxLinux Kernel4.15rc4******
    2.3OSLinuxLinux Kernel4.15rc5******
    2.3OSLinuxLinux Kernel4.15rc6******
    2.3OSLinuxLinux Kernel4.15rc7******
  • OR - Configuration 2
    Cpe VersionPartVendorProductVersionUpdateEditionLanguageSW EditionTarget SWTarget HWOtherVersion Start IncludingVersion End IncludingVersion Start ExcludingVersion End Excluding
    2.3OSDebianDebian Linux8.0*******
    2.3OSDebianDebian Linux9.0*******
  • OR - Configuration 3
    Cpe VersionPartVendorProductVersionUpdateEditionLanguageSW EditionTarget SWTarget HWOtherVersion Start IncludingVersion End IncludingVersion Start ExcludingVersion End Excluding
    2.3ApplicationRedhatVirtualization Host4.0*******
    2.3OSRedhatEnterprise Linux Desktop6.0*******
    2.3OSRedhatEnterprise Linux Desktop7.0*******
    2.3OSRedhatEnterprise Linux Server6.0*******
    2.3OSRedhatEnterprise Linux Server7.0*******
    2.3OSRedhatEnterprise Linux Server Aus7.6*******
    2.3OSRedhatEnterprise Linux Server Eus7.4*******
    2.3OSRedhatEnterprise Linux Server Eus7.6*******
    2.3OSRedhatEnterprise Linux Server Tus7.4*******
    2.3OSRedhatEnterprise Linux Server Tus7.6*******
    2.3OSRedhatEnterprise Linux Workstation6.0*******
    2.3OSRedhatEnterprise Linux Workstation7.0*******

Vulnerable Software List

VendorProductVersions
Debian Debian Linux 8.0, 9.0
Redhat Enterprise Linux Workstation 6.0, 7.0
Redhat Virtualization Host 4.0
Redhat Enterprise Linux Desktop 6.0, 7.0
Redhat Enterprise Linux Server Aus 7.6
Redhat Enterprise Linux Server Tus 7.4, 7.6
Redhat Enterprise Linux Server Eus 7.4, 7.6
Redhat Enterprise Linux Server 6.0, 7.0
Linux Linux Kernel *, 4.15

References

NameSourceURLTags
[oss-security] 20171206 Info Leak in the Linux Kernel via Bluetoothhttp://seclists.org/oss-sec/2017/q4/357MLISTIssue Tracking Mailing List Patch Third Party Advisory
102101http://www.securityfocus.com/bid/102101BIDIssue Tracking Third Party Advisory VDB Entry
RHSA-2018:0654https://access.redhat.com/errata/RHSA-2018:0654REDHATThird Party Advisory
RHSA-2018:0676https://access.redhat.com/errata/RHSA-2018:0676REDHATThird Party Advisory
RHSA-2018:1062https://access.redhat.com/errata/RHSA-2018:1062REDHATThird Party Advisory
RHSA-2018:1130https://access.redhat.com/errata/RHSA-2018:1130REDHATThird Party Advisory
RHSA-2018:1170https://access.redhat.com/errata/RHSA-2018:1170REDHATThird Party Advisory
RHSA-2018:1319https://access.redhat.com/errata/RHSA-2018:1319REDHATThird Party Advisory
https://help.ecostruxureit.com/display/public/UADCE725/Security+fixes+in+StruxureWare+Data+Center+Expert+v7.6.0https://help.ecostruxureit.com/display/public/UADCE725/Security+fixes+in+StruxureWare+Data+Center+ExCONFIRMThird Party Advisory
USN-3933-1https://usn.ubuntu.com/3933-1/UBUNTU
USN-3933-2https://usn.ubuntu.com/3933-2/UBUNTU
DSA-4073https://www.debian.org/security/2017/dsa-4073DEBIANThird Party Advisory
DSA-4082https://www.debian.org/security/2018/dsa-4082DEBIANThird Party Advisory