==========================================================================
Ubuntu Security Notice USN-3297-1
May 24, 2017

jbig2dec vulnerabilities
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

– Ubuntu 17.04
– Ubuntu 16.10
– Ubuntu 16.04 LTS
– Ubuntu 14.04 LTS

Summary:

Several security issues were fixed in jbig2dec.

Software Description:
– jbig2dec: JBIG2 decoder library

Details:

Bingchang Liu discovered that jbig2dec incorrectly handled memory when
decoding malformed image files. If a user or automated system were tricked
into processing a specially crafted JBIG2 image file, a remote attacker
could cause jbig2dec to crash, resulting in a denial of service, or
possibly execute arbitrary code. This issue only applied to Ubuntu 14.04
LTS, Ubuntu 16.04 LTS and Ubuntu 16.10. (CVE-2016-9601)

It was discovered that jbig2dec incorrectly handled memory when decoding
malformed image files. If a user or automated system were tricked into
processing a specially crafted JBIG2 image file, a remote attacker could
cause jbig2dec to crash, resulting in a denial of service, or possibly
disclose sensitive information. (CVE-2017-7885)

Jiaqi Peng discovered that jbig2dec incorrectly handled memory when
decoding malformed image files. If a user or automated system were tricked
into processing a specially crafted JBIG2 image file, a remote attacker
could cause jbig2dec to crash, resulting in a denial of service, or
possibly execute arbitrary code. (CVE-2017-7975)

Dai Ge discovered that jbig2dec incorrectly handled memory when decoding
malformed image files. If a user or automated system were tricked into
processing a specially crafted JBIG2 image file, a remote attacker could
cause jbig2dec to crash, resulting in a denial of service, or possibly
disclose sensitive information. (CVE-2017-7976)

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 17.04:
jbig2dec 0.13-4ubuntu0.1
libjbig2dec0 0.13-4ubuntu0.1

Ubuntu 16.10:
jbig2dec 0.13-2ubuntu0.1
libjbig2dec0 0.13-2ubuntu0.1

Ubuntu 16.04 LTS:
jbig2dec 0.12+20150918-1ubuntu0.1
libjbig2dec0 0.12+20150918-1ubuntu0.1

Ubuntu 14.04 LTS:
jbig2dec 0.11+20120125-1ubuntu1.1
libjbig2dec0 0.11+20120125-1ubuntu1.1

In general, a standard system update will make all the necessary changes.

References:
https://www.ubuntu.com/usn/usn-3297-1
CVE-2016-9601, CVE-2017-7885, CVE-2017-7975, CVE-2017-7976

Package Information:
https://launchpad.net/ubuntu/+source/jbig2dec/0.13-4ubuntu0.1
https://launchpad.net/ubuntu/+source/jbig2dec/0.13-2ubuntu0.1
https://launchpad.net/ubuntu/+source/jbig2dec/0.12+20150918-1ubuntu0.1
https://launchpad.net/ubuntu/+source/jbig2dec/0.11+20120125-1ubuntu1.1

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