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             AUSCERT External Security Bulletin Redistribution

                         freerdp2 security update
                             20 November 2023


        AusCERT Security Bulletin Summary

Product:           freerdp2
Publisher:         Debian
Operating System:  Debian GNU/Linux
Resolution:        Patch/Upgrade
CVE Names:         CVE-2023-39283 CVE-2022-41877 CVE-2022-39347
                   CVE-2022-39319 CVE-2022-39318 CVE-2022-39316
                   CVE-2022-39283 CVE-2022-39282 CVE-2022-24883

Original Bulletin: 

Comment: CVSS (Max):  9.8 CVE-2022-24883 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)
         CVSS Source: NIST
         Calculator:  https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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Debian LTS Advisory DLA-3654-1                debian-lts@lists.debian.org
https://www.debian.org/lts/security/                         Tobias Frost
November 17, 2023                             https://wiki.debian.org/LTS
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Package        : freerdp2
Version        : 2.3.0+dfsg1-2+deb10u4
CVE ID         : CVE-2021-41160 CVE-2022-24883 CVE-2022-39282 CVE-2022-39283
                 CVE-2022-39316 CVE-2022-39318 CVE-2022-39319 CVE-2022-39347

Debian Bug     : 1001062 1021659

Multiple vulnerabilties have been found in freelrdp2, a free implementation of
the Remote Desktop Protocol (RDP). The vulnerabilties potentially allows
authentication bypasses on configuration errors, buffer overreads, DoS vectors,
buffer overflows or accessing files outside of a shared directory.


    In affected versions a malicious server might trigger out of bound writes in a
    connected client. Connections using GDI or SurfaceCommands to send graphics
    updates to the client might send `0` width/height or out of bound rectangles to
    trigger out of bound writes. With `0` width or heigth the memory allocation
    will be `0` but the missing bounds checks allow writing to the pointer at this
    (not allocated) region.


    Prior to version 2.7.0, server side authentication against a `SAM` file might
    be successful for invalid credentials if the server has configured an invalid
    `SAM` file path. FreeRDP based clients are not affected. RDP server
    implementations using FreeRDP to authenticate against a `SAM` file are
    affected. Version 2.7.0 contains a fix for this issue. As a workaround, use
    custom authentication via `HashCallback` and/or ensure the `SAM` database path
    configured is valid and the application has file handles left.


    FreeRDP based clients on unix systems using `/parallel` command line switch
    might read uninitialized data and send it to the server the client is currently
    connected to. FreeRDP based server implementations are not affected.


    All FreeRDP based clients when using the `/video` command line switch might
    read uninitialized data, decode it as audio/video and display the result.
    FreeRDP based server implementations are not affected.


    In affected versions there is an out of bound read in ZGFX decoder component of
    FreeRDP. A malicious server can trick a FreeRDP based client to read out of
    bound data and try to decode it likely resulting in a crash.


    Affected versions of FreeRDP are missing input validation in `urbdrc` channel.
    A malicious server can trick a FreeRDP based client to crash with division by


    Affected versions of FreeRDP are missing input length validation in the
    `urbdrc` channel. A malicious server can trick a FreeRDP based client to read
    out of bound data and send it back to the server.


    Affected versions of FreeRDP are missing path canonicalization and base path
    check for `drive` channel. A malicious server can trick a FreeRDP based client
    to read files outside the shared directory.


    Affected versions of FreeRDP are missing input length validation in `drive`
    channel. A malicious server can trick a FreeRDP based client to read out of
    bound data and send it back to the server.

For Debian 10 buster, these problems have been fixed in version

We recommend that you upgrade your freerdp2 packages.

For the detailed security status of freerdp2 please refer to
its security tracker page at:

Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://wiki.debian.org/LTS

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