FreeBSD VuXML: Documenting security issues in FreeBSD and the FreeBSD Ports Collection

php-gd and gd -- Buffer over-read into uninitialized memory

Affected packages
	libgd	<	2.2.5
	php70-gd	<	7.0.21
	php71-gd	<	7.1.7

Details

VuXML ID	5033e2fc-98ec-4ef5-8e0b-87cfbbc73081
Discovery	2017-08-02
Entry	2017-09-26

PHP developers report:

The GIF decoding function gdImageCreateFromGifCtx in gd_gif_in.c in the GD Graphics Library (aka libgd), as used in PHP before 5.6.31 and 7.x before 7.1.7, does not zero colorMap arrays before use. A specially crafted GIF image could use the uninitialized tables to read ~700 bytes from the top of the stack, potentially disclosing sensitive information.

[source]

References

CVE Name	CVE-2017-7890
URL	https://bugs.php.net/bug.php?id=74435