Ubuntu update for LibGD

Published: 2017-08-14

Risk	Low
Patch available	YES
Number of vulnerabilities	1
CVE-ID	CVE-2017-7890
CWE-ID	CWE-200
Exploitation vector	Network
Public exploit	N/A
Vulnerable software Subscribe	Ubuntu Operating systems & Components / Operating system
Vendor	Canonical Ltd.

Security Bulletin

This security bulletin contains one low risk vulnerability.

1) Information disclosure

EUVDB-ID: #VU11789

Risk: Low

CVSSv3.1:

CVE-ID: CVE-2017-7890

CWE-ID:

Exploit availability:

Description

The vulnerability allows a remote attacker to obtain potentially sensitive information.

The weakness exists in the GIF decoding function gdImageCreateFromGifCtx in gd_gif_in.c due to it does not zero colorMap arrays before use. A remote attacker can trick the victim into opening a specially crafted GIF image that could use the uninitialized tables to read ~700 bytes from the top of the stack and gain access to potentially sensitive information.

Mitigation

Update the affected packages

Ubuntu 17.04:

libgd-tools 2.2.4-2ubuntu0.2

Ubuntu 16.04 LTS:

libgd-tools 2.1.1-4ubuntu0.16.04.7

Ubuntu 14.04 LTS:

libgd-tools 2.1.0-3ubuntu0.7

Vulnerable software versions

Ubuntu: 14.04 - 17.04

Fixed software versions

CPE2.3