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37 lines
1.4 KiB
Diff
37 lines
1.4 KiB
Diff
From 27b0cd89656d39266da7dcab7eb1812dcfc34192 Mon Sep 17 00:00:00 2001
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From: "Steven M. Schweda" <sms@antinode.info>
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Date: Sat, 15 Jun 2019 18:13:11 -0700
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Subject: [PATCH] Fix CVE-2014-9913, buffer overflow in unzip
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---
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list.c | 13 ++++++++++++-
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1 file changed, 12 insertions(+), 1 deletion(-)
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diff --git a/list.c b/list.c
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index 5de41e5..e488109 100644
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--- a/list.c
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+++ b/list.c
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@@ -339,7 +339,18 @@ int list_files(__G) /* return PK-type error code */
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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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--
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2.20.1
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