CVE-2017-7890

Description

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.

Category

6.5
CVSS
Severity: Medium
CVSS 3.0 •
CVSS 2.0 •
EPSS 3.88% Top 15%
Vendor Advisory debian.org Vendor Advisory redhat.com Vendor Advisory redhat.com Vendor Advisory php.net Vendor Advisory php.net Vendor Advisory php.net Vendor Advisory php.net
Affected: n/a n/a
Published at:
Updated at:

References

Link Tags
https://bugs.php.net/patch-display.php?bug=74435&patch=fix-74435-php-7.0&revision=1497970038 issue tracking patch vendor advisory
https://www.tenable.com/security/tns-2017-12
http://www.debian.org/security/2017/dsa-3938 vendor advisory
https://access.redhat.com/errata/RHSA-2018:1296 vendor advisory
http://php.net/ChangeLog-5.php release notes vendor advisory
https://security.netapp.com/advisory/ntap-20180112-0001/
http://www.securityfocus.com/bid/99492 vdb entry third party advisory
http://php.net/ChangeLog-7.php release notes vendor advisory
https://access.redhat.com/errata/RHSA-2018:0406 vendor advisory
https://bugs.php.net/bug.php?id=74435 patch vendor advisory

Frequently Asked Questions

What is the severity of CVE-2017-7890?
CVE-2017-7890 has been scored as a medium severity vulnerability.
How to fix CVE-2017-7890?
To fix CVE-2017-7890, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2017-7890 being actively exploited in the wild?
It is possible that CVE-2017-7890 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~4% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
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