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CVE-2020-4033— OOB Read in RLEDECOMPRESS 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之前版本中的RLEDECOMPRESS存在缓冲区错误漏洞。该漏洞源于网络系统或产品在内存上执行操作时，未正确验证数据边界，导致向关联的其他内存位置上执行了错误的读写操作。攻击者可利用该漏洞导致缓冲区溢出或堆溢出等。

CVSS 3.1 · Low EPSS 1.84% · P78

Possible ATT&CK Techniques 1 AI

T1210 · Exploitation of Remote Services
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I. Basic Information for CVE-2020-4033

Vulnerability Information
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Vulnerability Title
OOB Read in RLEDECOMPRESS in FreeRDP
Source: CVE Program / CVE List V5
Vulnerability Description
In FreeRDP before version 2.1.2, there is an out of bounds read in RLEDECOMPRESS. All FreeRDP based clients with sessions with color depth < 32 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:U/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存读
Source: CVE Program / CVE List V5
Vulnerability Title
FreeRDP 缓冲区错误漏洞
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之前版本中的RLEDECOMPRESS存在缓冲区错误漏洞。该漏洞源于网络系统或产品在内存上执行操作时，未正确验证数据边界，导致向关联的其他内存位置上执行了错误的读写操作。攻击者可利用该漏洞导致缓冲区溢出或堆溢出等。
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-2020-4033

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III. Intelligence Information for CVE-2020-4033

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Patches & Fixes for CVE-2020-4033 (1)

Vendor Advisories for CVE-2020-4033 (2)

Mailing List Discussions for CVE-2020-4033 (4)

Other References for CVE-2020-4033 (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-2020-4031 3.5 LOW Use-After-Free in gdi_SelectObject in FreeRDP
CVE-2020-4032 3.1 LOW Integer casting vulnerability in `update_recv_secondary_order` in FreeRDP

IV. Related Vulnerabilities

Same product: FreeRDP
Same vendor: FreeRDP
Same weakness: CWE-125

V. Comments for CVE-2020-4033

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