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- From: "Steven M. Schweda" <sms@antinode.info>
- Subject: Fix CVE-2016-9844, buffer overflow in zipinfo
- Bug-Debian: https://bugs.debian.org/847486
- Bug-Ubuntu: https://launchpad.net/bugs/1643750
- X-Debian-version: 6.0-21
-
- --- a/zipinfo.c
- +++ b/zipinfo.c
- @@ -1921,7 +1921,18 @@ 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
- + * 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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