Executive Summary
| Informations | |||
|---|---|---|---|
| Name | CVE-2019-18420 | First vendor Publication | 2019-10-31 |
| Vendor | Cve | Last vendor Modification | 2024-11-21 |
Security-Database Scoring CVSS v3
| Cvss vector : CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H | |||
|---|---|---|---|
| Overall CVSS Score | 6.5 | ||
| Base Score | 6.5 | Environmental Score | 6.5 |
| impact SubScore | 3.6 | Temporal Score | 6.5 |
| Exploitabality Sub Score | 2.8 | ||
| Attack Vector | Network | Attack Complexity | Low |
| Privileges Required | Low | User Interaction | None |
| Scope | Unchanged | Confidentiality Impact | None |
| Integrity Impact | None | Availability Impact | High |
| Calculate full CVSS 3.0 Vectors scores | |||
Security-Database Scoring CVSS v2
| Cvss vector : (AV:N/AC:M/Au:S/C:N/I:N/A:C) | |||
|---|---|---|---|
| Cvss Base Score | 6.3 | Attack Range | Network |
| Cvss Impact Score | 6.9 | Attack Complexity | Medium |
| Cvss Expoit Score | 6.8 | Authentication | Requires single instance |
| Calculate full CVSS 2.0 Vectors scores | |||
Detail
| An issue was discovered in Xen through 4.12.x allowing x86 PV guest OS users to cause a denial of service via a VCPUOP_initialise hypercall. hypercall_create_continuation() is a variadic function which uses a printf-like format string to interpret its parameters. Error handling for a bad format character was done using BUG(), which crashes Xen. One path, via the VCPUOP_initialise hypercall, has a bad format character. The BUG() can be hit if VCPUOP_initialise executes for a sufficiently long period of time for a continuation to be created. Malicious guests may cause a hypervisor crash, resulting in a Denial of Service (DoS). Xen versions 4.6 and newer are vulnerable. Xen versions 4.5 and earlier are not vulnerable. Only x86 PV guests can exploit the vulnerability. HVM and PVH guests, and guests on ARM systems, cannot exploit the vulnerability. |
Original Source
| Url : http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-18420 |
CWE : Common Weakness Enumeration
| % | Id | Name |
|---|---|---|
| 100 % | CWE-134 | Uncontrolled Format String (CWE/SANS Top 25) |
CPE : Common Platform Enumeration
Sources (Detail)
Alert History
| Date | Informations |
|---|---|
| 2024-11-28 13:29:19 |
|
| 2023-11-07 21:38:55 |
|
| 2023-02-23 09:27:32 |
|
| 2021-09-02 01:34:40 |
|
| 2021-05-04 13:29:52 |
|
| 2021-04-22 02:44:17 |
|
| 2021-03-27 01:29:41 |
|
| 2020-09-03 01:26:21 |
|
| 2020-05-23 02:26:58 |
|
