Wireshark · Wireshark-bugs: [Wireshark-bugs] [Bug 9672] New: Memory corruption in packet-nfs.c

[bugzilla-daemon@xxxxxxxxxxxxx]

Bug ID	9672
Summary	Memory corruption in packet-nfs.c
Classification	Unclassified
Product	Wireshark
Version	SVN
Hardware	x86
OS	Windows 7
Status	UNCONFIRMED
Severity	Major
Priority	Low
Component	Dissection engine (libwireshark)
Assignee	bugzilla-admin@wireshark.org
Reporter	me@moshekaplan.com

Build Information:
wireshark 1.11.3 (SVNRev 54856 from /trunk)
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A remote attacker can create a specially-crafted packet that when processed,
causes Wireshark to crash, due to an out of bounds memcpy.

Steps to replicate:
0) Open Wireshark
1) Under "Protocol Preferences" check the box to allow NFS to "Snoop FH to
filename mappings".
2) Open the attached pcap

Tested on Wireshark svnr54856

This packet causes Wireshark to allocate 0 bytes, and then attempt to copy
~2^32 bytes into the allocated memory, which causes Wireshark to crash.

Relevant Code:

nfs_name_snoop_add_name(civ->xid, tvb,
    offset+36, tvb_get_ntohl(tvb, offset+32),
    offset, 32, NULL);

nfs_name_snoop_add_name(int xid, tvbuff_t *tvb, int name_offset, int name_len,
int parent_offset,
            int parent_len, const char *name)
{
    // ... <SNIP> ...
    if (name) {
        // ... <SNIP> ...
    } else {
        nns->name_len = name_len;
        nns->name = (char *)g_malloc(name_len+1);
        memcpy(nns->name, ptr, name_len);
    }

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