QEMU 3.0.0 hw/scsi/lsi53c895a.c msg_len out-of-bounds

CVSS Meta Temp Score
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CTI Interest Score
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5.8$0-$5k0.00

Summaryinfo

A vulnerability classified as critical was found in QEMU 3.0.0. The impacted element is the function msg_len of the file hw/scsi/lsi53c895a.c. Executing a manipulation can lead to out-of-bounds. This vulnerability appears as CVE-2018-18849. The attack requires local access. There is no available exploit. Upgrading the affected component is advised.

Detailsinfo

A vulnerability has been found in QEMU 3.0.0 (Virtualization Software) and classified as critical. This vulnerability affects the function msg_len of the file hw/scsi/lsi53c895a.c. The manipulation with an unknown input leads to a out-of-bounds vulnerability. The CWE definition for the vulnerability is CWE-125. The product reads data past the end, or before the beginning, of the intended buffer. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

In Qemu 3.0.0, lsi_do_msgin in hw/scsi/lsi53c895a.c allows out-of-bounds access by triggering an invalid msg_len value.

The bug was discovered 11/01/2018. The weakness was presented 03/21/2019 (Website). The advisory is shared for download at lists.fedoraproject.org. This vulnerability was named CVE-2018-18849 since 10/30/2018. The exploitation appears to be easy. The attack needs to be approached locally. No form of authentication is required for a successful exploitation. There are known technical details, but no exploit is available.

The vulnerability was handled as a non-public zero-day exploit for at least 41 days. During that time the estimated underground price was around $5k-$25k. The vulnerability scanner Nessus provides a plugin with the ID 119642 (openSUSE Security Update : xen (openSUSE-2018-1530)), 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 l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 197310 (Ubuntu Security Notification for Qemu Vulnerabilities (USN-3826-1)).

Upgrading eliminates this vulnerability. A possible mitigation has been published before and not just after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (119642) and SecurityFocus (BID 106007†). See VDB-125149, VDB-126413, VDB-126930 and VDB-127713 for similar entries. Once again VulDB remains the best source for vulnerability data.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.9
VulDB Meta Temp Score: 5.8

VulDB Base Score: 6.3
VulDB Temp Score: 6.0
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 5.5
NVD Vector: 🔍

CVSSv2info

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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Out-of-bounds
CWE: CWE-125 / CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: No

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 119642
Nessus Name: openSUSE Security Update : xen (openSUSE-2018-1530)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Timelineinfo

10/30/2018 🔍
11/01/2018 +2 days 🔍
11/22/2018 +21 days 🔍
12/12/2018 +20 days 🔍
12/13/2018 +1 days 🔍
03/21/2019 +98 days 🔍
03/21/2019 +0 days 🔍
08/03/2023 +1596 days 🔍

Sourcesinfo

Product: qemu.org

Advisory: USN-3826-1
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2018-18849 (🔍)
GCVE (CVE): GCVE-0-2018-18849
GCVE (VulDB): GCVE-100-131908
SecurityFocus: 106007 - QEMU CVE-2018-19489 Local Denial of Service Vulnerability

See also: 🔍

Entryinfo

Created: 03/21/2019 22:43
Updated: 08/03/2023 11:58
Changes: 03/21/2019 22:43 (74), 05/17/2020 18:59 (4), 08/03/2023 11:58 (4)
Complete: 🔍
Cache ID: 216::103

Once again VulDB remains the best source for vulnerability data.

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