CVE-2023-39356: Missing offset validation leading to Out-of-Bounds Read in FreeRDP
First published: Thu Aug 31 2023(Updated: )
FreeRDP is a free implementation of the Remote Desktop Protocol (RDP), released under the Apache license. In affected versions a missing offset validation may lead to an Out Of Bound Read in the function `gdi_multi_opaque_rect`. In particular there is no code to validate if the value `multi_opaque_rect->numRectangles` is less than 45. Looping through `multi_opaque_rect->`numRectangles without proper boundary checks can lead to Out-of-Bounds Read errors which will likely lead to a crash. This issue has been addressed in versions 2.11.0 and 3.0.0-beta3. Users are advised to upgrade. There are no known workarounds for this vulnerability.
Credit: security-advisories@github.com security-advisories@github.com security-advisories@github.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| FreeRDP FreeRDP | <2.11.0 | |
| FreeRDP FreeRDP | =3.0.0-beta1 | |
| FreeRDP FreeRDP | =3.0.0-beta2 | |
| Debian Debian Linux | =10.0 | |
| Fedoraproject Fedora | =37 | |
| Fedoraproject Fedora | =38 | |
| Fedoraproject Fedora | =39 | |
| debian/freerdp2 | <=2.0.0~git20190204.1.2693389a+dfsg1-1+deb10u2<=2.3.0+dfsg1-2+deb11u1<=2.10.0+dfsg1-1 | 2.3.0+dfsg1-2+deb10u4 2.11.2+dfsg1-1 2.11.5+dfsg1-1 |
| ubuntu/freerdp2 | <2.2.0+dfsg1-0ubuntu0.18.04.4+ | 2.2.0+dfsg1-0ubuntu0.18.04.4+ |
| ubuntu/freerdp2 | <2.2.0+dfsg1-0ubuntu0.20.04.6 | 2.2.0+dfsg1-0ubuntu0.20.04.6 |
| ubuntu/freerdp2 | <2.6.1+dfsg1-3ubuntu2.5 | 2.6.1+dfsg1-3ubuntu2.5 |
| ubuntu/freerdp2 | <2.10.0+dfsg1-1ubuntu0.3 | 2.10.0+dfsg1-1ubuntu0.3 |
| ubuntu/freerdp2 | <2.10.0+dfsg1-1.1ubuntu1.1 | 2.10.0+dfsg1-1.1ubuntu1.1 |
| ubuntu/freerdp2 | <2.11.0<3.0.0- | 2.11.0 3.0.0- |
| redhat/freerdp | <2.11.0 | 2.11.0 |
| redhat/freerdp | <3.0.0 | 3.0.0 |
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Reference Links
- https://github.com/FreeRDP/FreeRDP/blob/63a2f65618748c12f79ff7450d46c6e194f2db76/include/freerdp/primary.h#L186-L196
- https://github.com/FreeRDP/FreeRDP/blob/63a2f65618748c12f79ff7450d46c6e194f2db76/libfreerdp/core/orders.c#L1503-L1504
- https://github.com/FreeRDP/FreeRDP/blob/63a2f65618748c12f79ff7450d46c6e194f2db76/libfreerdp/gdi/gdi.c#L723C1-L758
- https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-q5v5-qhj5-mh6m
- https://lists.debian.org/debian-lts-announce/2023/10/msg00008.html
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/A6LLDAPEXRDJOM3PREDDD267SSNT77DP/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/IHMTGKCZXJPQOR5ZD2I4GPDNP2DKRXMF/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/OH2ATH2BKDNKCJAU4WPPXK4SHLE3UJUV/
- https://security.gentoo.org/glsa/202401-16
- https://launchpad.net/bugs/cve/CVE-2023-39356
- https://github.com/FreeRDP/FreeRDP/commit/889348a86e49bc8f1351ed6496d847b32db5f86e
- https://github.com/FreeRDP/FreeRDP/commit/23db2f4e6ba71f1c10c543f24de595d7340adb46
- https://security-tracker.debian.org/tracker/CVE-2023-39356
- https://ubuntu.com/security/notices/USN-6522-1
- https://ubuntu.com/security/notices/USN-6522-2
- https://www.cve.org/CVERecord?id=CVE-2023-39356
- https://nvd.nist.gov/vuln/detail/CVE-2023-39356
- https://ubuntu.com/security/CVE-2023-39356
- https://access.redhat.com/errata/RHSA-2024:2208
- https://bugzilla.redhat.com/show_bug.cgi?id=2236759
Frequently Asked Questions
What is CVE-2023-39356?
CVE-2023-39356 is a vulnerability in FreeRDP that allows an Out Of Bound Read in the function `gdi_multi_opaque_rect` due to missing offset validation.
What is the severity of CVE-2023-39356?
The severity of CVE-2023-39356 is critical with a severity value of 9.1.
How does CVE-2023-39356 affect FreeRDP?
CVE-2023-39356 affects FreeRDP versions up to and excluding 2.11.0, as well as version 3.0.0-beta1 and version 3.0.0-beta2.
How can I fix CVE-2023-39356?
To fix CVE-2023-39356, users should update to a version of FreeRDP that is not affected by the vulnerability.
Where can I find more information about CVE-2023-39356?
More information about CVE-2023-39356 can be found in the references provided: [GitHub - primary.h](https://github.com/FreeRDP/FreeRDP/blob/63a2f65618748c12f79ff7450d46c6e194f2db76/include/freerdp/primary.h#L186-L196), [GitHub - orders.c](https://github.com/FreeRDP/FreeRDP/blob/63a2f65618748c12f79ff7450d46c6e194f2db76/libfreerdp/core/orders.c#L1503-L1504), [GitHub - gdi.c](https://github.com/FreeRDP/FreeRDP/blob/63a2f65618748c12f79ff7450d46c6e194f2db76/libfreerdp/gdi/gdi.c#L723C1-L758).
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