medium
6.5
CWE
200
Advisory Published
CVE Published
Updated

CVE-2017-7890: Infoleak

First published: Thu Jul 06 2017(Updated: )

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.

Credit: cve@mitre.org

Affected SoftwareAffected VersionHow to fix
redhat/php<5.6.31
5.6.31
redhat/php<7.0.21
7.0.21
redhat/php<7.1.7
7.1.7
PHP<7.0.21
7.0.21
PHP<=5.6.30
PHP=7.0.0
PHP=7.0.1
PHP=7.0.2
PHP=7.0.3
PHP=7.0.4
PHP=7.0.5
PHP=7.0.6
PHP=7.0.7
PHP=7.0.8
PHP=7.0.9
PHP=7.0.10
PHP=7.0.11
PHP=7.0.12
PHP=7.0.13
PHP=7.0.14
PHP=7.0.15
PHP=7.0.16
PHP=7.0.17
PHP=7.0.18
PHP=7.0.19
PHP=7.0.20
PHP=7.1.0
PHP=7.1.1
PHP=7.1.2
PHP=7.1.3
PHP=7.1.4
PHP=7.1.5
PHP=7.1.6

Remedy

https://bugs.php.net/bug.php?id=74435

Remedy

https://bugs.php.net/patch-display.php?bug=74435&patch=fix-74435-php-7.0&revision=1497970038

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Reference Links

Frequently Asked Questions

  • What is the severity of CVE-2017-7890?

    CVE-2017-7890 is classified as a medium severity vulnerability due to the potential for information disclosure.

  • How do I fix CVE-2017-7890?

    To fix CVE-2017-7890, upgrade to PHP version 5.6.31 or 7.0.21 or later.

  • What versions of PHP are affected by CVE-2017-7890?

    CVE-2017-7890 affects PHP versions prior to 5.6.31, 7.0.20, and 7.1.6.

  • What types of attacks can be executed using CVE-2017-7890?

    An attacker can exploit CVE-2017-7890 to retrieve sensitive information from server memory by providing a crafted GIF image.

  • Is CVE-2017-7890 a remote or local vulnerability?

    CVE-2017-7890 can be exploited remotely by an attacker through the upload and processing of a malicious GIF file.

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