From: "Steven M. Schweda" Subject: Fix CVE-2014-9913, buffer overflow in unzip Bug: https://sourceforge.net/p/infozip/bugs/27/ Bug-Debian: https://bugs.debian.org/847485 Bug-Ubuntu: https://launchpad.net/bugs/387350 X-Debian-version: 6.0-21 --- a/list.c +++ b/list.c @@ -339,7 +339,18 @@ G.crec.compression_method == ENHDEFLATED) { methbuf[5] = dtype[(G.crec.general_purpose_bit_flag>>1) & 3]; } else if (methnum >= NUM_METHODS) { - sprintf(&methbuf[4], "%03u", G.crec.compression_method); + /* 2013-02-26 SMS. + * http://sourceforge.net/p/infozip/bugs/27/ CVE-2014-9913. + * Unexpectedly large compression methods overflow + * &methbuf[]. Use the old, three-digit decimal format + * for values which fit. Otherwise, sacrifice the + * colon, and use four-digit hexadecimal. + */ + if (G.crec.compression_method <= 999) { + sprintf( &methbuf[ 4], "%03u", G.crec.compression_method); + } else { + sprintf( &methbuf[ 3], "%04X", G.crec.compression_method); + } } #if 0 /* GRR/Euro: add this? */