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.
The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Php | Php | * | 5.6.30 (including) |
| Php | Php | 7.0.0 (including) | 7.0.0 (including) |
| Php | Php | 7.0.1 (including) | 7.0.1 (including) |
| Php | Php | 7.0.2 (including) | 7.0.2 (including) |
| Php | Php | 7.0.3 (including) | 7.0.3 (including) |
| Php | Php | 7.0.4 (including) | 7.0.4 (including) |
| Php | Php | 7.0.5 (including) | 7.0.5 (including) |
| Php | Php | 7.0.6 (including) | 7.0.6 (including) |
| Php | Php | 7.0.7 (including) | 7.0.7 (including) |
| Php | Php | 7.0.8 (including) | 7.0.8 (including) |
| Php | Php | 7.0.9 (including) | 7.0.9 (including) |
| Php | Php | 7.0.10 (including) | 7.0.10 (including) |
| Php | Php | 7.0.11 (including) | 7.0.11 (including) |
| Php | Php | 7.0.12 (including) | 7.0.12 (including) |
| Php | Php | 7.0.13 (including) | 7.0.13 (including) |
| Php | Php | 7.0.14 (including) | 7.0.14 (including) |
| Php | Php | 7.0.15 (including) | 7.0.15 (including) |
| Php | Php | 7.0.16 (including) | 7.0.16 (including) |
| Php | Php | 7.0.17 (including) | 7.0.17 (including) |
| Php | Php | 7.0.18 (including) | 7.0.18 (including) |
| Php | Php | 7.0.19 (including) | 7.0.19 (including) |
| Php | Php | 7.0.20 (including) | 7.0.20 (including) |
| Php | Php | 7.1.0 (including) | 7.1.0 (including) |
| Php | Php | 7.1.1 (including) | 7.1.1 (including) |
| Php | Php | 7.1.2 (including) | 7.1.2 (including) |
| Php | Php | 7.1.3 (including) | 7.1.3 (including) |
| Php | Php | 7.1.4 (including) | 7.1.4 (including) |
| Php | Php | 7.1.5 (including) | 7.1.5 (including) |
| Php | Php | 7.1.6 (including) | 7.1.6 (including) |
| Red Hat Enterprise Linux 7 | RedHat | php-0:5.4.16-43.el7_4.1 | * |
| Red Hat Software Collections for Red Hat Enterprise Linux 6 | RedHat | rh-php70-php-0:7.0.27-1.el6 | * |
| Red Hat Software Collections for Red Hat Enterprise Linux 6.7 EUS | RedHat | rh-php70-php-0:7.0.27-1.el6 | * |
| Red Hat Software Collections for Red Hat Enterprise Linux 7 | RedHat | rh-php70-php-0:7.0.27-1.el7 | * |
| Red Hat Software Collections for Red Hat Enterprise Linux 7.3 EUS | RedHat | rh-php70-php-0:7.0.27-1.el7 | * |
| Red Hat Software Collections for Red Hat Enterprise Linux 7.4 EUS | RedHat | rh-php70-php-0:7.0.27-1.el7 | * |
| Red Hat Software Collections for Red Hat Enterprise Linux 7.5 EUS | RedHat | rh-php70-php-0:7.0.27-1.el7 | * |
| Libgd2 | Ubuntu | devel | * |
| Libgd2 | Ubuntu | trusty | * |
| Libgd2 | Ubuntu | upstream | * |
| Libgd2 | Ubuntu | xenial | * |
| Libgd2 | Ubuntu | zesty | * |
| Php5 | Ubuntu | upstream | * |
| Php7.0 | Ubuntu | upstream | * |
| Php7.1 | Ubuntu | upstream | * |
There are many different kinds of mistakes that introduce information exposures. The severity of the error can range widely, depending on the context in which the product operates, the type of sensitive information that is revealed, and the benefits it may provide to an attacker. Some kinds of sensitive information include:
Information might be sensitive to different parties, each of which may have their own expectations for whether the information should be protected. These parties include:
Information exposures can occur in different ways:
It is common practice to describe any loss of confidentiality as an “information exposure,” but this can lead to overuse of CWE-200 in CWE mapping. From the CWE perspective, loss of confidentiality is a technical impact that can arise from dozens of different weaknesses, such as insecure file permissions or out-of-bounds read. CWE-200 and its lower-level descendants are intended to cover the mistakes that occur in behaviors that explicitly manage, store, transfer, or cleanse sensitive information.