Bug#975875: x11vnc: CVE-2020-29074

[Salvatore Bonaccorso <carnil@debian.org>]

Source: x11vnc
Version: 0.9.13-6
Severity: grave
Tags: security upstream fixed-upstream
Justification: user security hole
X-Debbugs-Cc: carnil@debian.org, Debian Security Team <team@security.debian.org>
Control: found -1 0.9.16-4

Hi,

The following vulnerability was published for x11vnc.

CVE-2020-29074[0]:
| scan.c in x11vnc 0.9.16 uses IPC_CREAT|0777 in shmget calls, which
| allows access by actors other than the current user.


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-2020-29074
    https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-29074
[1] https://github.com/LibVNC/x11vnc/commit/69eeb9f7baa14ca03b16c9de821f9876def7a36a

Given the relative minor change I have already picked up the commit
for a buster-security update as well.

Regards,
Salvatore