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xpdf: memory corruption via Gfx
Synthesis of the vulnerability
An attacker can invite the victim to display a malicious PDF document with xpdf, in order to execute code on his computer.
Vulnerable products: Unix (platform) ~ not comprehensive.
Severity of this weakness: 2/4.
Consequences of a hack: user access/rights, denial of service on client.
Hacker's origin: document.
Creation date: 21/01/2011.
Références of this bulletin: BID-45948, CVE-2010-4654, VIGILANCE-VUL-10290.
Description of the vulnerability
The xpdf program displays PDF or PostScript documents, which can contain TrueType character fonts.
A TrueType font is composed of shapes (lines and Bezier curves) and of a "program" which adapts these outlines on the display grid.
The Gfx() function of the poppler/Gfx.cc file displays characters. However, if the "program" uses too many instructions unstacking the stack, the memory is corrupted.
An attacker can therefore invite the victim to display a malicious PDF document with xpdf, in order to execute code on his computer.
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