An issue was discovered in LibVNCServer before 0.9.13. There is an information leak (of uninitialized memory contents) in the libvncclient/rfbproto.c ConnectToRFBRepeater function.
Weakness
The product does not initialize a critical resource.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Libvncserver | Libvnc_project | * | 0.9.12 (including) |
| Red Hat Enterprise Linux 8 | RedHat | libvncserver-0:0.9.11-17.el8 | * |
| Libvncserver | Ubuntu | bionic | * |
| Libvncserver | Ubuntu | eoan | * |
| Libvncserver | Ubuntu | focal | * |
| Libvncserver | Ubuntu | trusty | * |
| Libvncserver | Ubuntu | xenial | * |
| Veyon | Ubuntu | eoan | * |
| Veyon | Ubuntu | focal | * |
| Veyon | Ubuntu | groovy | * |
| Veyon | Ubuntu | hirsute | * |
| Veyon | Ubuntu | impish | * |
| Veyon | Ubuntu | kinetic | * |
| Veyon | Ubuntu | lunar | * |
| Veyon | Ubuntu | mantic | * |
| Veyon | Ubuntu | oracular | * |
| Veyon | Ubuntu | plucky | * |
| Veyon | Ubuntu | trusty | * |
| Vino | Ubuntu | trusty | * |
| X11vnc | Ubuntu | bionic | * |
| X11vnc | Ubuntu | eoan | * |
| X11vnc | Ubuntu | focal | * |
| X11vnc | Ubuntu | groovy | * |
| X11vnc | Ubuntu | hirsute | * |
| X11vnc | Ubuntu | impish | * |
| X11vnc | Ubuntu | kinetic | * |
| X11vnc | Ubuntu | lunar | * |
| X11vnc | Ubuntu | mantic | * |
| X11vnc | Ubuntu | trusty | * |
| X11vnc | Ubuntu | trusty/esm | * |
| X11vnc | Ubuntu | xenial | * |
Potential Mitigations
References
- http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00033.html
- http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00055.html
- http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00066.html
- https://cert-portal.siemens.com/productcert/pdf/ssa-390195.pdf
- https://github.com/LibVNC/libvncserver/compare/LibVNCServer-0.9.12...LibVNCServer-0.9.13
- https://github.com/LibVNC/libvncserver/issues/253
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4F6FUH4EFK4NAP6GT4TQRTBKWIRCZLIY/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/NVP7TJVYJDXDFRHVQ3ENEN3H354QPXEZ/
- http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00033.html
- http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00055.html
- http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00066.html
- https://cert-portal.siemens.com/productcert/pdf/ssa-390195.pdf
- https://github.com/LibVNC/libvncserver/compare/LibVNCServer-0.9.12...LibVNCServer-0.9.13
- https://github.com/LibVNC/libvncserver/issues/253
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4F6FUH4EFK4NAP6GT4TQRTBKWIRCZLIY/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/NVP7TJVYJDXDFRHVQ3ENEN3H354QPXEZ/