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Advisories

FreeRDP before 3.32.2 Use-After-Free via rdpgfx Dynamic Virtual Channel Close

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Severity
critical
Date
Affecting

  • FreeRDP >= 0, < 3.32.2

CWE
  • CWE-416 Use After Free
CVSS
9.3
CVSS V4 Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Credit
smaeljaish771, KeenSecurityLab
Description
FreeRDP before 3.32.2 has a use-after-free in the client's rdpgfx dynamic virtual channel: a duplicate-name channel with a new ChannelId overwrites the listener's single callback slot, which rdpgfx_on_close frees without clearing. A malicious RDP server can open and close such a channel, then send a PDU on the original channel to crash the client or potentially execute code.

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