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Developers plug critical PNG graphic bug

Potential problem nipped in the bud

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Developers have plugged a critical hole in a PNG reference library used by many browsers to render graphics file.

The 1.2.44 and 1.4.3 updates to the libpng open source reference library address a bug that, left unfixed, created a mechanism for hackers to inject code onto vulnerable systems.

Older versions of the Portable Network Graphics (PNG) format library contained a buffer overflow-style flaw.

The bug was discovered by developers at Mozilla. It's unclear which browsers supported the vulnerable library files.

Previous problems involving the rendering of PNG files have spawned drive-by download attacks, so the resolution of the latest problem at an early stage is to be welcomed.

In related news, developers also fixed a similar flaw in the libtiff library. Version 3.9.4 of the libtiff library plugs a buffer overflow bug that might be abused by specially crafted SubjectDistance tags, H Security reports. ®

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