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

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

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 vulnerability database at Tenable (119642). See 125149, 126413, 126930 and 127713 for similar entries.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

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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
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CVSSv2info

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VulDB Base Score: 🔍
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Exploitinginfo

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

Local: Yes
Remote: No

Availability: 🔍
Status: Not defined

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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: 🔍
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Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
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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 (🔍)
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: 🔍

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