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29 lines
1.1 KiB
Diff
29 lines
1.1 KiB
Diff
From: "Steven M. Schweda" <sms@antinode.info>
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Subject: Fix CVE-2016-9844, buffer overflow in zipinfo
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Bug-Debian: https://bugs.debian.org/847486
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Bug-Ubuntu: https://launchpad.net/bugs/1643750
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X-Debian-version: 6.0-21
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--- a/zipinfo.c
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+++ b/zipinfo.c
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@@ -1921,7 +1921,18 @@ static int zi_short(__G) /* return PK-
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ush dnum=(ush)((G.crec.general_purpose_bit_flag>>1) & 3);
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methbuf[3] = dtype[dnum];
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} else if (methnum >= NUM_METHODS) { /* unknown */
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- sprintf(&methbuf[1], "%03u", G.crec.compression_method);
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+ /* 2016-12-05 SMS.
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+ * https://launchpad.net/bugs/1643750
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+ * Unexpectedly large compression methods overflow
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+ * &methbuf[]. Use the old, three-digit decimal format
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+ * for values which fit. Otherwise, sacrifice the "u",
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+ * and use four-digit hexadecimal.
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+ */
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+ if (G.crec.compression_method <= 999) {
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+ sprintf( &methbuf[ 1], "%03u", G.crec.compression_method);
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+ } else {
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+ sprintf( &methbuf[ 0], "%04X", G.crec.compression_method);
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+ }
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}
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for (k = 0; k < 15; ++k)
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