[patch] 18-cve-2014-9913-unzip-buffer-overflow.patch

18-cve-2014-9913-unzip-buffer-overflow.patch (text/plain), 1.35 KB, created by Andrey Ovcharov on 2017-06-03 05:27:42 UTC

From: "Steven M. Schweda" <[e-mail]>
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

Upstream-Status: Backport

Signed-off-by: Zhixiong Chi <[e-mail]>

--- 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? */