Fabrice Bellard QEMU pci_dma_read/write input validation

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6.3$0-$5k0.00

A vulnerability, which was classified as critical, has been found in Fabrice Bellard QEMU (Virtualization Software) (unknown version). This issue affects an unknown code of the file pci_dma_read/write. The manipulation with an unknown input leads to a privilege escalation vulnerability. Using CWE to declare the problem leads to CWE-20. Impacted is confidentiality, integrity, and availability.

The weakness was published 03/01/2016 as Bug 1300771 as confirmed bug report (Bugzilla). It is possible to read the advisory at bugzilla.redhat.com. The identification of this vulnerability is CVE-2015-8818 since 03/01/2016. The exploitation is known to be difficult. The attack needs to be initiated within the local network. A simple authentication is needed for exploitation. Technical details of the vulnerability are known, but there is no available exploit. The following code is the reason for this vulnerability:

len = MIN(len, (addr | iotlb.addr_mask) - addr + 1);

The vulnerability scanner Nessus provides a plugin with the ID 91660 (SUSE SLED12 / SLES12 Security Update : qemu (SUSE-SU-2016:1560-1)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family SuSE Local Security Checks and running in the context local. The commercial vulnerability scanner Qualys is able to test this issue with plugin 168944 (SUSE Enterprise Linux Security update for qemu (SUSE-SU-2016:1560-1)).

Applying a patch is able to eliminate this problem. The bugfix is ready for download at git.qemu.org. A possible mitigation has been published 4 months after the disclosure of the vulnerability. The vulnerability will be addressed with the following lines of code:

*plen = MIN(*plen, (addr | iotlb.addr_mask) - addr + 1);

The vulnerability is also documented in the databases at SecurityFocus (BID 69654), X-Force (111188) and Tenable (91660). Similar entries are available at 67460, 75987, 81088 and 81154.

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CVSSv3infoedit

VulDB Meta Base Score: 7.3
VulDB Meta Temp Score: 6.3

VulDB Base Score: 9.0
VulDB Temp Score: 7.8
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 5.5
NVD Vector: 🔍

CVSSv2infoedit

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Exploitinginfoedit

Class: Privilege escalation
CWE: CWE-20
ATT&CK: Unknown

Local: No
Remote: Partially

Availability: 🔍
Status: Unproven

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 91660
Nessus Name: SUSE SLED12 / SLES12 Security Update : qemu (SUSE-SU-2016:1560-1)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 55710
OpenVAS Name: SuSE Update for xen SUSE-SU-2016:1318-1 (xen)
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfoedit

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Countermeasuresinfoedit

Recommended: Patch
Status: 🔍

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0-Day Time: 🔍
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Patch: git.qemu.org

Timelineinfoedit

03/01/2016 🔍
03/01/2016 +0 days 🔍
03/03/2016 +2 days 🔍
06/13/2016 +101 days 🔍
06/17/2016 +4 days 🔍
12/29/2016 +195 days 🔍
09/21/2018 +631 days 🔍

Sourcesinfoedit

Vendor: https://bellard.org/

Advisory: Bug 1300771
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2015-8818 (🔍)
SecurityFocus: 69654
X-Force: 111188 - Qemu address_space_translate denial of service

See also: 🔍

Entryinfoedit

Created: 03/03/2016 10:53 AM
Updated: 09/21/2018 09:33 AM
Changes: (17) vulnerability_cvss2_nvd_av vulnerability_cvss2_nvd_ac vulnerability_cvss2_nvd_au vulnerability_cvss2_nvd_ci vulnerability_cvss2_nvd_ii vulnerability_cvss2_nvd_ai vulnerability_cvss3_vuldb_av vulnerability_cvss3_vuldb_ac vulnerability_cvss3_vuldb_pr vulnerability_cvss3_vuldb_ui vulnerability_cvss3_vuldb_s vulnerability_cvss3_vuldb_c vulnerability_cvss3_vuldb_i vulnerability_cvss3_vuldb_a advisory_confirm_url countermeasure_date source_securityfocus
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