QEMU hw/rdma/vmw/pvrdma_cmd.c create_cq_ring/create_qp_rings null pointer dereference

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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6.4$0-$5k0.00

A vulnerability was found in QEMU (Virtualization Software) (the affected version unknown). It has been declared as problematic. Affected by this vulnerability is the function create_cq_ring/create_qp_rings of the file hw/rdma/vmw/pvrdma_cmd.c. The manipulation with an unknown input leads to a null pointer dereference vulnerability. The CWE definition for the vulnerability is CWE-476. A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit. As an impact it is known to affect availability. The summary by CVE is:

hw/rdma/vmw/pvrdma_cmd.c in QEMU allows attackers to cause a denial of service (NULL pointer dereference or excessive memory allocation) in create_cq_ring or create_qp_rings.

The bug was discovered 12/19/2018. The weakness was disclosed 12/20/2018 by Li Qiang (oss-sec). The advisory is shared at openwall.com. This vulnerability is known as CVE-2018-20125 since 12/13/2018. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details are known, but no exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 06/20/2023).

The vulnerability was handled as a non-public zero-day exploit for at least 1 days. During that time the estimated underground price was around $5k-$25k. The commercial vulnerability scanner Qualys is able to test this issue with plugin 157908 (Oracle Enterprise Linux Security Update for qemu (ELSA-2019-4518)).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at SecurityFocus (BID 106298†).

Productinfo

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License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB CVSS-B Score: 🔍
VulDB CVSS-BT Score: 🔍
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.4
VulDB Meta Temp Score: 6.4

VulDB Base Score: 5.3
VulDB Temp Score: 5.3
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.5
NVD Vector: 🔍

CVSSv2info

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

NVD Base Score: 🔍

Exploitinginfo

Class: Null pointer dereference
CWE: CWE-476 / CWE-404
CAPEC: 🔍
ATT&CK: 🔍

Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Qualys ID: 🔍
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Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍

Timelineinfo

12/13/2018 🔍
12/19/2018 +6 days 🔍
12/19/2018 +0 days 🔍
12/20/2018 +1 days 🔍
12/20/2018 +0 days 🔍
12/21/2018 +1 days 🔍
06/20/2023 +1642 days 🔍

Sourcesinfo

Product: qemu.org

Advisory: USN-3923-1
Researcher: Li Qiang
Status: Confirmed

CVE: CVE-2018-20125 (🔍)
SecurityFocus: 106298 - QEMU 'hw/rdma/vmw/pvrdma_cmd.c' Multiple Local Denial of Service Vulnerabilities

Entryinfo

Created: 12/21/2018 01:02 PM
Updated: 06/20/2023 02:10 PM
Changes: 12/21/2018 01:02 PM (61), 04/23/2020 09:14 AM (4), 06/20/2023 02:10 PM (3)
Complete: 🔍
Cache ID: 35:A34:40

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