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Debian Security Advisory DSA-4243-1                   security@debian.org
https://www.debian.org/security/                            Luciano Bello
July 11, 2018                         https://www.debian.org/security/faq
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Package        : cups
CVE ID         : CVE-2017-15400 CVE-2018-4180 CVE-2018-4181 CVE-2018-4182 
                 CVE-2018-4183 CVE-2018-6553

Several vulnerabilities were discovered in CUPS, the Common UNIX Printing
System. These issues have been identified with the following CVE ids:

CVE-2017-15400

    Rory McNamara discovered that an attacker is able to execute arbitrary
    commands (with the privilege of the CUPS daemon) by setting a
    malicious IPP server with a crafted PPD file.

CVE-2018-4180

     Dan Bastone of Gotham Digital Science discovered that a local
     attacker with access to cupsctl could escalate privileges by setting
     an environment variable. 

CVE-2018-4181

     Eric Rafaloff and John Dunlap of Gotham Digital Science discovered
     that a local attacker can perform limited reads of arbitrary files
     as root by manipulating cupsd.conf.

CVE-2018-4182

    Dan Bastone of Gotham Digital Science discovered that an attacker
    with sandboxed root access can execute backends without a sandbox
    profile by provoking an error in CUPS' profile creation.

CVE-2018-4183

     Dan Bastone and Eric Rafaloff of Gotham Digital Science discovered
     that an attacker with sandboxed root access can execute arbitrary
     commands as unsandboxed root by modifying /etc/cups/cups-files.conf

CVE-2018-6553

    Dan Bastone of Gotham Digital Science discovered that an attacker
    can bypass the AppArmor cupsd sandbox by invoking the dnssd backend
    using an alternate name that has been hard linked to dnssd.


For the stable distribution (stretch), these problems have been fixed in
version 2.2.1-8+deb9u2.

We recommend that you upgrade your cups packages.

For the detailed security status of cups please refer to
its security tracker page at:
https://security-tracker.debian.org/tracker/source-package/cups

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://www.debian.org/security/

Mailing list: debian-security-announce@lists.debian.org