29 lines
1.2 KiB
Diff
29 lines
1.2 KiB
Diff
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From: "Steven M. Schweda" <sms@antinode.info>
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Subject: Fix CVE-2014-9913, buffer overflow in unzip
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Bug: https://sourceforge.net/p/infozip/bugs/27/
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Bug-Debian: https://bugs.debian.org/847485
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Bug-Ubuntu: https://launchpad.net/bugs/387350
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--- list.c
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+++ list.c
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@@ -339,7 +339,18 @@
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G.crec.compression_method == ENHDEFLATED) {
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methbuf[5] = dtype[(G.crec.general_purpose_bit_flag>>1) & 3];
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} else if (methnum >= NUM_METHODS) {
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- sprintf(&methbuf[4], "%03u", G.crec.compression_method);
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+ /* 2013-02-26 SMS.
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+ * http://sourceforge.net/p/infozip/bugs/27/ CVE-2014-9913.
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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
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+ * colon, 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[ 4], "%03u", G.crec.compression_method);
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+ } else {
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+ sprintf( &methbuf[ 3], "%04X", G.crec.compression_method);
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+ }
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}
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#if 0 /* GRR/Euro: add this? */
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