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Debian LTS: Security Advisory for libvncserver (DLA-2264-1)

Information

Severity

Severity

High

Family

Family

Debian Local Security Checks

CVSSv2 Base

CVSSv2 Base

7.5

CVSSv2 Vector

CVSSv2 Vector

AV:N/AC:L/Au:N/C:P/I:P/A:P

Solution Type

Solution Type

Vendor Patch

Created

Created

3 years ago

Modified

Modified

3 years ago

Summary

The remote host is missing an update for the 'libvncserver' package(s) announced via the DLA-2264-1 advisory.

Insight

Insight

Several vulnerabilities have been discovered in libVNC (libvncserver Debian package), an implemenantation of the VNC server and client protocol. CVE-2019-20839 libvncclient/sockets.c in LibVNCServer had a buffer overflow via a long socket filename. CVE-2020-14397 libvncserver/rfbregion.c had a NULL pointer dereference. CVE-2020-14399 Byte-aligned data was accessed through uint32_t pointers in libvncclient/rfbproto.c. CVE-2020-14400 Byte-aligned data was accessed through uint16_t pointers in libvncserver/translate.c. CVE-2020-14401 libvncserver/scale.c had a pixel_value integer overflow. CVE-2020-14402 libvncserver/corre.c allowed out-of-bounds access via encodings. CVE-2020-14403 libvncserver/hextile.c allowed out-of-bounds access via encodings. CVE-2020-14404 libvncserver/rre.c allowed out-of-bounds access via encodings. CVE-2020-14405 libvncclient/rfbproto.c does not limit TextChat size.

Affected Software

Affected Software

'libvncserver' package(s) on Debian Linux.

Detection Method

Detection Method

Checks if a vulnerable package version is present on the target host.

Solution

Solution

For Debian 8 'Jessie', these problems have been fixed in version 0.9.9+dfsg2-6.1+deb8u8. We recommend that you upgrade your libvncserver packages.