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CVE-2020-4031— Use-After-Free in gdi_SelectObject in FreeRDP

Quick assessment

Affected
FreeRDP FreeRDP
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.

FreeRDP是FreeRDP团队的一款开源的远程桌面协议（RDP）的实现。 FreeRDP 2.1.2之前版本中存在资源管理错误漏洞。该漏洞源于网络系统或产品对系统资源（如内存、磁盘空间、文件等）的管理不当。

CVSS 3.5 · Low EPSS 1.81% · P77

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution
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I. Basic Information for CVE-2020-4031

Vulnerability Information
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Vulnerability Title
Use-After-Free in gdi_SelectObject in FreeRDP
Source: CVE Program / CVE List V5
Vulnerability Description
In FreeRDP before version 2.1.2, there is a use-after-free in gdi_SelectObject. All FreeRDP clients using compatibility mode with /relax-order-checks are affected. This is fixed in version 2.1.2.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
释放后使用
Source: CVE Program / CVE List V5
Vulnerability Title
FreeRDP 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
FreeRDP是FreeRDP团队的一款开源的远程桌面协议（RDP）的实现。 FreeRDP 2.1.2之前版本中存在资源管理错误漏洞。该漏洞源于网络系统或产品对系统资源（如内存、磁盘空间、文件等）的管理不当。
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
FreeRDP FreeRDP < 2.1.2 -

II. Public POCs for CVE-2020-4031

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III. Intelligence Information for CVE-2020-4031

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Patches & Fixes for CVE-2020-4031 (1)

Vendor Advisories for CVE-2020-4031 (2)

Mailing List Discussions for CVE-2020-4031 (4)

Other References for CVE-2020-4031 (1)

Same Patch Batch · FreeRDP · 2020-06-22 · 9 CVEs total

CVE-2020-11095 3.5 LOW Global OOB read in update_recv_primary_order in FreeRDP
CVE-2020-11096 3.5 LOW Global OOB read in update_read_cache_bitmap_v3_order in FreeRDP
CVE-2020-11097 3.5 LOW OOB read in ntlm_av_pair_get in FreeRDP
CVE-2020-11098 3.5 LOW Out-of-bound read in glyph_cache_put in FreeRDP
CVE-2020-11099 3.5 LOW OOB Read in license_read_new_or_upgrade_license_packet in FreeRDP
CVE-2020-4030 3.5 LOW OOB read in `TrioParse` in FreeRDP
CVE-2020-4032 3.1 LOW Integer casting vulnerability in `update_recv_secondary_order` in FreeRDP
CVE-2020-4033 3.1 LOW OOB Read in RLEDECOMPRESS in FreeRDP

IV. Related Vulnerabilities

Same product: FreeRDP
Same vendor: FreeRDP
Same weakness: CWE-416

V. Comments for CVE-2020-4031

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