FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.24.0, division by zero in MS-ADPCM and IMA-ADPCM decoders when nBlockAlign is 0, leading to a crash. In libfreerdp/codec/dsp.c, both ADPCM decoders use size % block_size where block_size = context->common.format.nBlockAlign.
The nBlockAlign value comes from the Server Audio Formats PDU on the RDPSND channel. The value 0 is not validated anywhere before reaching the decoder. When nBlockAlign = 0, the modulo operation causes a SIGFPE (floating point exception) crash.
This vulnerability is fixed in 3.24.0.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
None
No data leak
Integrity
None
No data modification
Availability
High
Complete denial of service
CVSS Vector v3.1
Weakness Type (CWE)
Vulnerable Products 1
| Configuration | From (including) | Up to (excluding) |
|---|---|---|
|
Freerdp Freerdp
cpe:2.3:a:freerdp:freerdp:*:*:*:*:*:*:*:*
|
— |
3.24.0
|
References 3
https://github.com/FreeRDP/FreeRDP/commit/03b48b3601d867afccac1cdc6081de7a275ed…
security-advisories@github.com
https://github.com/FreeRDP/FreeRDP/commit/16df2300e1e3f5a51f68fb1626429e58b531b…
security-advisories@github.com
https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-jp7m-94ww-p56r
security-advisories@github.com