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CVE-2019-18423

Quick assessment

Affected
n/a n/a
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Xen是英国剑桥大学的一款开源的虚拟机监视器产品。该产品能够使不同和不兼容的操作系统运行在同一台计算机上，并支持在运行时进行迁移，保证正常运行并且避免宕机。 Xen 4.12.x及之前版本中存在安全漏洞。攻击者可利用该漏洞造成拒绝服务。

AI Predicted 8.1 Difficulty: Moderate EPSS 2.06% · P81

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2019-18423

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
An issue was discovered in Xen through 4.12.x allowing ARM guest OS users to cause a denial of service via a XENMEM_add_to_physmap hypercall. p2m->max_mapped_gfn is used by the functions p2m_resolve_translation_fault() and p2m_get_entry() to sanity check guest physical frame. The rest of the code in the two functions will assume that there is a valid root table and check that with BUG_ON(). The function p2m_get_root_pointer() will ignore the unused top bits of a guest physical frame. This means that the function p2m_set_entry() will alias the frame. However, p2m->max_mapped_gfn will be updated using the original frame. It would be possible to set p2m->max_mapped_gfn high enough to cover a frame that would lead p2m_get_root_pointer() to return NULL in p2m_get_entry() and p2m_resolve_translation_fault(). Additionally, the sanity check on p2m->max_mapped_gfn is off-by-one allowing "highest mapped + 1" to be considered valid. However, p2m_get_root_pointer() will return NULL. The problem could be triggered with a specially crafted hypercall XENMEM_add_to_physmap{, _batch} followed by an access to an address (via hypercall or direct access) that passes the sanity check but cause p2m_get_root_pointer() to return NULL. A malicious guest administrator may cause a hypervisor crash, resulting in a Denial of Service (DoS). Xen version 4.8 and newer are vulnerable. Only Arm systems are vulnerable. x86 systems are not affected.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Xen 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Xen是英国剑桥大学的一款开源的虚拟机监视器产品。该产品能够使不同和不兼容的操作系统运行在同一台计算机上，并支持在运行时进行迁移，保证正常运行并且避免宕机。 Xen 4.12.x及之前版本中存在安全漏洞。攻击者可利用该漏洞造成拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
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II. Public POCs for CVE-2019-18423

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III. Intelligence Information for CVE-2019-18423

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Vendor Advisories for CVE-2019-18423 (2)

Mailing List Discussions for CVE-2019-18423 (4)

Other References for CVE-2019-18423 (1)

Same Patch Batch · n/a · 2019-10-31 · 54 CVEs total

CVE-2019-5151 10.0 CRITICAL YouPHPTube SQL注入漏洞
CVE-2019-5150 8.9 HIGH YouPHPTube SQL注入漏洞
CVE-2019-18369 JetBrains YouTrack 安全漏洞
CVE-2019-18420 Xen 格式化字符串错误漏洞
CVE-2019-18360 JetBrains Hub 信息泄露漏洞
CVE-2019-18422 Xen 安全漏洞
CVE-2019-18424 Xen 操作系统命令注入漏洞
CVE-2019-18425 Xen 安全漏洞
CVE-2019-18421 Xen 竞争条件问题漏洞
CVE-2019-18367 JetBrains TeamCity 安全漏洞
CVE-2010-2490 Mumble 输入验证错误漏洞
CVE-2019-18368 JetBrains Toolbox 安全漏洞
CVE-2019-18366 JetBrains TeamCity 安全漏洞
CVE-2009-5043 burn 安全漏洞
CVE-2009-5041 OVERKILL Software overkill 缓冲区错误漏洞
CVE-2009-5042 python-docutils 安全漏洞
CVE-2019-12612 Bitdefender BOX 输入验证错误漏洞
CVE-2019-16251 WordPress YIT Plugin Framework 安全漏洞
CVE-2019-18465 Progress Software MOVEit Transfer 访问控制错误漏洞
CVE-2019-18464 Progress Software MOVEit Transfer SQL注入漏洞

Showing top 20 of 54 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

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Same vendor: n/a

V. Comments for CVE-2019-18423

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