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Date: Thu, 10 Dec 2015 22:04:02 +0800 (CST)
From: xiaoqixue_1 <xiaoqixue_1@....com>
To: cve-assign@...re.org
Cc: oss-security@...ts.openwall.com,
yuchen-tsinghua <yuchen@...l.tsinghua.edu.cn>
Subject: CVE request - read underflow in libpng 1.2.55, 1.0.65, 1.4.18, and
1.5.25 (pngwutil.c)
there is a underflow read in png_check_keyword in pngwutil.c in libpng-1.2.54, which is found by XiaoQixue and ChenYu.
if the data of "key" is only ' ' (0x20), it will read a byte before the buffer in line 1288.
it also impacts libpng 1.2.55, 1.0.65, 1.4.18, and 1.5.25 .
the details as follows:
https://sourceforge.net/p/libpng/bugs/244/
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