CVE-2020-11739
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（Cambridge）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 4.13.x 版本及之前版本中存在竞争条件问题漏洞，该漏洞源于读写解锁路径中缺少内存屏障。攻击者可利用该漏洞导致拒绝服务，可能获取敏感信息或提升权限。
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I. Basic Information for CVE-2020-11739
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 4.13.x, allowing guest OS users to cause a denial of service or possibly gain privileges because of missing memory barriers in read-write unlock paths. The read-write unlock paths don't contain a memory barrier. On Arm, this means a processor is allowed to re-order the memory access with the preceding ones. In other words, the unlock may be seen by another processor before all the memory accesses within the "critical" section. As a consequence, it may be possible to have a writer executing a critical section at the same time as readers or another writer. In other words, many of the assumptions (e.g., a variable cannot be modified after a check) in the critical sections are not safe anymore. The read-write locks are used in hypercalls (such as grant-table ones), so a malicious guest could exploit the race. For instance, there is a small window where Xen can leak memory if XENMAPSPACE_grant_table is used concurrently. A malicious guest may be able to leak memory, or cause a hypervisor crash resulting in a Denial of Service (DoS). Information leak and privilege escalation cannot be excluded.
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 竞争条件问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Xen是英国剑桥（Cambridge）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 4.13.x 版本及之前版本中存在竞争条件问题漏洞，该漏洞源于读写解锁路径中缺少内存屏障。攻击者可利用该漏洞导致拒绝服务，可能获取敏感信息或提升权限。
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 |
|---|---|---|---|---|
| - | n/a | n/a | - |
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II. Public POCs for CVE-2020-11739
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2020-11739 (2)
Mailing List Discussions for CVE-2020-11739 (5)
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http://lists.opensuse.org/opensuse-security-announce/2020-05/msg00006.html vendor-advisory x_refsource_SUSE
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https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/YMAW7D2MP6RE4BFI5BZWOBBWGY3VSOFN/ vendor-advisory x_refsource_FEDORA
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https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/NVTP4OYHCTRU3ONFJOFJQVNDFB25KLLG/ vendor-advisory x_refsource_FEDORA
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https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5M2XRNCHOGGTJQBZQJ7DCV6ZNAKN3LE2/ vendor-advisory x_refsource_FEDORA
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Other References for CVE-2020-11739 (2)
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https://xenbits.xen.org/xsa/advisory-314.html x_refsource_MISC
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http://xenbits.xen.org/xsa/advisory-314.html x_refsource_CONFIRM
Same Patch Batch · n/a · 2020-04-14 · 32 CVEs total
| CVE-2020-10382 | MB CONNECT LINE mymbCONNECT24和mbCONNECT24 安全漏洞 | |
| CVE-2020-11740 | Xen 信息泄露漏洞 | |
| CVE-2020-11741 | Xen 安全漏洞 | |
| CVE-2020-11742 | Xen 安全漏洞 | |
| CVE-2020-11743 | Xen 安全漏洞 | |
| CVE-2020-5738 | Grandstream GXP1600 后置链接漏洞 | |
| CVE-2020-5739 | Grandstream GXP1600 代码注入漏洞 | |
| CVE-2020-9460 | Octech Oempro 跨站脚本漏洞 | |
| CVE-2020-9461 | Octech Oempro 跨站脚本漏洞 | |
| CVE-2020-9004 | Wowza Media Systems Streaming Engine 访问控制错误漏洞 | |
| CVE-2020-7958 | OnePlus 7 Pro 信息泄露漏洞 | |
| CVE-2019-16879 | Synergy Systems & Solutions HUSKY RTU 6049-E70 访问控制错误漏洞 | |
| CVE-2020-7800 | Synergy Systems & Solutions HUSKY RTU 6049-E70 代码问题漏洞 | |
| CVE-2020-7801 | Synergy Systems & Solutions HUSKY RTU 6049-E70 信息泄露漏洞 | |
| CVE-2020-7802 | Synergy Systems & Solutions HUSKY RTU 6049-E70 安全漏洞 | |
| CVE-2020-10381 | MB CONNECT LINE mymbCONNECT24和mbCONNECT24 SQL注入漏洞 | |
| CVE-2020-11758 | Industrial Light and Magic OpenEXR 缓冲区错误漏洞 | |
| CVE-2020-10383 | MB CONNECT LINE mymbCONNECT24和mbCONNECT24 安全漏洞 | |
| CVE-2020-10384 | MB CONNECT LINE mymbCONNECT24 安全漏洞 | |
| CVE-2019-18822 | ZOOM Call Recording 安全漏洞 |
Showing top 20 of 32 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
V. Comments for CVE-2020-11739
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