[Bug 1513] New: Security fix for yet another nasm buffer overflow.

blfs-bugs at linuxfromscratch.org blfs-bugs at linuxfromscratch.org
Mon Aug 8 14:46:03 PDT 2005


           Summary: Security fix for yet another nasm buffer overflow.
           Product: Beyond LinuxFromScratch
           Version: b-6.1-pre1
          Platform: PC
               URL: http://cvs.sourceforge.net/viewcvs.py/nasm/nasm/output/
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: BOOK
        AssignedTo: blfs-book at linuxfromscratch.org
        ReportedBy: ken at kenmoffat.uklinux.net
         QAContact: blfs-book at linuxfromscratch.org

Nasm-0.98.39 fixed the CAN-2004-1287 buffer overflow.  The following patch taken
from CVS addresses CAN-2005-1194.  Vulnerability is probably low.

 I've just submitted this with the proper headers to patches as
nasm-0.98.39-security_fix-1.patch. Ken

--- nasm-0.98.39/output/outieee.c.orig  2005-01-15 22:16:08.000000000 +0000
+++ nasm-0.98.39/output/outieee.c       2005-08-08 22:12:46.000000000 +0100
@@ -1120,7 +1120,7 @@
     va_list ap;

     va_start(ap, format);
-    vsprintf(buffer, format, ap);
+    vsnprintf(buffer, sizeof(buffer), format, ap);
     l = strlen(buffer);
     for (i = 0; i < l; i++)
         if ((buffer[i] & 0xff) > 31)

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