Integer overflow in src/zm.c:zsdata() causes crash in sz and can leak information to receiver.
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Patch taken from Fedora.
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CVE: CVE-2018-10195
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Upstream-Status: Inappropriate (dead upstream)
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Signed-off-by: Ross Burton <ross.burton@intel.com>
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diff -urN lrzsz-0.12.20/src/zm.c lrzsz-0.12.20.new/src/zm.c
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--- lrzsz-0.12.20/src/zm.c Tue Dec 29 09:48:38 1998
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+++ lrzsz-0.12.20.new/src/zm.c Tue Oct 8 12:46:58 2002
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@@ -431,10 +431,12 @@
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VPRINTF(3,("zsdata: %lu %s", (unsigned long) length,
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Zendnames[(frameend-ZCRCE)&3]));
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crc = 0;
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- do {
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- zsendline(*buf); crc = updcrc((0377 & *buf), crc);
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- buf++;
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- } while (--length>0);
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+
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+ for( ; length; length--) {
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+ zsendline(*buf); crc = updcrc((0377 & *buf), crc);
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+ buf++;
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+ }
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+
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xsendline(ZDLE); xsendline(frameend);
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crc = updcrc(frameend, crc);
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