[Secure-testing-team] Bug#850008: libvncserver: CVE-2016-9942

Salvatore Bonaccorso carnil at debian.org
Tue Jan 3 06:13:34 UTC 2017


Source: libvncserver
Version: 0.9.10+dfsg-3
Severity: grave
Tags: security patch upstream
Justification: user security hole

Hi,

the following vulnerability was published for libvncserver.

CVE-2016-9942[0]:
| Heap-based buffer overflow in ultra.c in LibVNCClient in LibVNCServer
| before 0.9.11 allows remote servers to cause a denial of service
| (application crash) or possibly execute arbitrary code via a crafted
| FramebufferUpdate message with the Ultra type tile, such that the LZO
| payload decompressed length exceeds what is specified by the tile
| dimensions.

Fixing commit in [1].

If you fix the vulnerability please also make sure to include the
CVE (Common Vulnerabilities & Exposures) id in your changelog entry.

For further information see:

[0] https://security-tracker.debian.org/tracker/CVE-2016-9942
    https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-9942
[1] https://github.com/LibVNC/libvncserver/pull/137/commits/5fff4353f66427b467eb29e5fdc1da4f2be028bb

Please adjust the affected versions in the BTS as needed.

Regards,
Salvatore



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