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unzip.7892
CVE-2016-9844.patch
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File CVE-2016-9844.patch of Package unzip.7892
Index: unzip60/zipinfo.c =================================================================== --- unzip60.orig/zipinfo.c +++ unzip60/zipinfo.c @@ -1927,7 +1927,18 @@ static int zi_short(__G) /* return PK- ush dnum=(ush)((G.crec.general_purpose_bit_flag>>1) & 3); methbuf[3] = dtype[dnum]; } else if (methnum >= NUM_METHODS) { /* unknown */ - sprintf(&methbuf[1], "%03u", G.crec.compression_method); + /* 2016-12-05 SMS. + * https://launchpad.net/bugs/1643750 CVE-2016-9844. + * Unexpectedly large compression methods overflow + * &methbuf[]. Use the old, three-digit decimal format + * for values which fit. Otherwise, sacrifice the "u", + * and use four-digit hexadecimal. + */ + if (G.crec.compression_method <= 999) { + sprintf( &methbuf[ 1], "%03u", G.crec.compression_method); + } else { + sprintf( &methbuf[ 0], "%04X", G.crec.compression_method); + } } for (k = 0; k < 15; ++k)
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