Fwd: [oss-security] Re: ScriptFu Server Buffer Overflow in GIMP <= 2.6

[Eitan Adler]

A vulnerability has been found in a port you maintain. If you haven't
yet done so
please update the port and write up a VuXML report. If you need help
feel free to
email ports-security at freebsd.org.


---------- Forwarded message ----------
From:  <mancha at mac.hush.com>
Date: 30 June 2012 19:44
Subject: [oss-security] Re: ScriptFu Server Buffer Overflow in GIMP <= 2.6
To: oss-security at lists.openwall.com


Below find a patch for the 2.6.x branch of GIMP to address a potential
buffer overflow in the script-fu server (CVE-2012-2763) reported on this list
by J. Sheridan (http://www.openwall.com/lists/oss-security/2012/05/31/1)

 --mancha

======================

Fix for CVE-2012-2763 for GIMP 2.6.x by mancha. Based on commit
76155d79df8d497. Thanks to muks, Kevin, and Ankh for identifying the
relevant code change.

Ref: Fixed potential buffer overflow in readstr_upto().

----------

--- a/plug-ins/script-fu/tinyscheme/scheme.c            2012-06-30
+++ b/plug-ins/script-fu/tinyscheme/scheme.c            2012-06-30
@@ -1727,7 +1727,8 @@ static char *readstr_upto(scheme *sc, ch
     c = inchar(sc);
     len = g_unichar_to_utf8(c, p);
     p += len;
-  } while (c && !is_one_of(delim, c));
+  } while ((p - sc->strbuff < sizeof(sc->strbuff)) &&
+          (c && !is_one_of(delim, c)));

   if(p==sc->strbuff+2 && c_prev=='\\')
     *p = '\0';



-- 
Eitan Adler