https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=16461
Bug ID: 16461
Summary: Read of uninitialized memory in find_signature
Product: Wireshark
Version: Git
Hardware: x86
OS: Linux
Status: UNCONFIRMED
Severity: Major
Priority: Low
Component: Capture file support (libwiretap)
Assignee: bugzilla-ad...@wireshark.org
Reporter: fabien.lheur...@trust-in-soft.com
Target Milestone: ---
Created attachment 17697
--> https://bugs.wireshark.org/bugzilla/attachment.cgi?id=17697&action=edit
This pcap file was generated by AFL and should allow to reproduce the issue
Build Information:
Paste the COMPLETE build information from "Help->About Wireshark", "wireshark
-v", or "tshark -v".
--
## Analysis Context
*The verification was performed with TrustInSoft Analyzer, a formal
static analyzer for C and C++.*
*The result is part of a larger security assessment performed by
TrustInSoft for* ***Naval Group***.
The analysis of wireshark was performed in the following environment:
----------------- ----------------------------------------------
Platform Ubuntu Linux 18.04
Tool TrustInSoft Analyzer, a formal static analyzer
Input Files Fuzzing of 10 000 pcap file using AFL
Verification Analysis of `process_cap_file` with the AFL corpus
------------- ----------------------------------------------
------------ ------------------- ---------------------- ----------------
Wireshark version v2.6.16rc0 git commit dcd65a4012
https://github.com/wireshark/wireshark.git
glib version 2.62.6 git commit eb0f73a39
https://github.com/GNOME/glib.git
libgcrypt version 1.8.5 git commit ada758e3
https://github.com/gpg/libgcrypt.git
libgpg-error version 1.37 git commit 85b5006
https://github.com/gpg/libgpg-error.git
libpcap version 1.9.1 git commit 1547215c
https://github.com/the-tcpdump-group/libpcap.git
pcre version 8.43-RC1 git commit 10e4adb
https://github.com/svn2github/pcre.git
pcre2 version 10.10 git commit a677f5b
https://github.com/luvit/pcre2.git
zlib version 10.10 git commit a677f5b
https://github.com/madler/zlib.git
------------ ------------------- ---------------------- ----------------
- valgrind is deactivated in glib
- PCRE library is deactivated in glib
- `cap_files_hashes` is deactivated in wireshark
## Uninitialized Variable in *find_signature*
In the function `find_signature`, the variable `m_ptr[pay_off]` where
`pay_off` is equal to `56` may be pointing to uninitialized data.
File: wireshark/wiretap/vwr.c
```c
if (m_ptr[pay_off] == 0xdd) /* if magic byte is present */
return pay_off;
```
The variable `m_ptr` is pointing to an offset of a global variable of
type `char [32768]` that was allocated in the function
`vwr_process_rec_data`. Its content is written by the function
`wtap_read_bytes` and, after this call, the buffer is uninitialized
starting from the offset `52`.
--
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