[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Date: Tue, 24 May 2016 11:51:13 +0300
From: Solar Designer <solar@...nwall.com>
To: Yue Liu <liuyue0310@...il.com>
Cc: oss-security@...ts.openwall.com, David Anderson <davea42@...uxmail.org>
Subject: Re: CVE request: Multiple vunerabilities in libdwarf & dwarfdump
Hi,
On oss-security it is strongly preferred that actual content (rather
than just links) be included in the postings for long-term archival,
as long as the message doesn't exceed 200 KB (including MIME overhead).
On Tue, May 24, 2016 at 04:01:42PM +0800, Yue Liu wrote:
> There are multiple vunerabilities in libdwarf&dwarfdump which were
> discovered by Yue Liu(lieanu <liuyue0310@...il.com>) and Qixue Xiao.
>
> Vulnerabilities DW201605-001 to DW201605-019 in
> https://www.prevanders.net/dwarfbug.html
I've attached the current content of the above web page to this message,
as text/plain.
> And anther one https://bugzilla.redhat.com/show_bug.cgi?id=1330237
Here it is:
---
Description of problem:
There is a NULL pointer dereference bug in libdwarf-20160115 and latest git code.
The bug is at file dwarf_leb.c:147
143 byte_length++;
144 if (byte_length > BYTESLEBMAX) {
145 /* Erroneous input. What to do?
146 Abort? Return error? Just stop here?*/
147 *leb128_length = BYTESLEBMAX; <- $pc
148 return number;
149 }
150 }
which triggered by dwarf_form.c:918
913 *return_sval = (Dwarf_Signed) ret_value;
914 return DW_DLV_OK;
915 }
916
917 case DW_FORM_sdata:
918 ret_value =
919 (_dwarf_decode_s_leb128(attr->ar_debug_ptr, NULL));
920 *return_sval = ret_value;
921 return DW_DLV_OK;
922
Version-Release number of selected component (if applicable):
Tested in libdwarf-20160115 and latest git code
---
> All vulnerabilities have been fixed in upstream.
>
> POC: https://sourceforge.net/p/libdwarf/regressiontests/ci/master/tree/liu/
Unfortunately, some of the PoCs are a bit too large to attach. While
the above directory is ~110 KB under tar.xz, the PoC attached to Red Hat
Bugzilla Bug 1330237 is ~150 KB under xz.
So let's keep just the vulnerability detail in here for now.
One of the reasons why I am posting this is to provide an example of
what content to include in oss-security postings going forward. Also,
it's a call for smaller PoCs (for further occasions; no need to rework
these PoCs now), so that those could be included as well.
Alexander
View attachment "dwarfbug.txt" of type "text/plain" (17124 bytes)
Powered by blists - more mailing lists
Please check out the
Open Source Software Security Wiki, which is counterpart to this
mailing list.
Confused about mailing lists and their use?
Read about mailing lists on Wikipedia
and check out these
guidelines on proper formatting of your messages.
