CVE-2015-8729
medium
CVSS v3
5.5
CVSS v4 NEW
—
VIR risk
6.5
Description
The ascend_seek function in wiretap/ascendtext.c in the Ascend file parser in Wireshark 1.12.x before 1.12.9 and 2.0.x before 2.0.1 does not ensure the presence of a '\0' character at the end of a date string, which allows remote attackers to cause a denial of service (out-of-bounds read and application crash) via a crafted file.
Predictions
Exploit likelihood
55%
Patch ETA
—
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
Exploits
Public proof-of-concept code below. AS-IS, for defenders and authorised testing only.
Exploit-DB
Wireshark - ascend_seek Static Out-of-Bounds Read
Source: https://code.google.com/p/google-security-research/issues/detail?id=646
The following crash due to a static out-of-bounds read can be observed in an ASAN build of Wireshark (current git master), by feeding a malformed file to tshark ("$ ./tshark -nVxr /path/to/file"):
Attached are three files which trigger the crash.
--- cut ---
==5629==ERROR: AddressSanitizer: global-buffer-overflow on address 0x0000044bf7e6 at pc 0x0000009eb451 bp 0x7ffcd2fd6050 sp 0x7ffcd2fd6048
READ of size 1 at 0x0000044bf7e6 thread T0
#0 0x9eb450 in ascend_seek wireshark/wiretap/ascendtext.c:105:19
#1 0x9ea5e0 in ascend_open wireshark/wiretap/ascendtext.c:167:12
#2 0x83f7c6 in wtap_open_offline wireshark/wiretap/file_access.c:1042:13
#3 0x53214d in cf_open wireshark/tshark.c:4195:9
#4 0x52bc7e in main wireshark/tshark.c:2188:9
0x0000044bf7e6 is located 58 bytes to the left of global variable '<string literal>' defined in 'ascendtext.c:61:25' (0x44bf820) of size 10
'<string literal>' is ascii string 'PRI-XMIT-'
0x0000044bf7e6 is located 0 bytes to the right of global variable '<string literal>' defined in 'ascendtext.c:117:30' (0x44bf7e0) of size 6
'<string literal>' is ascii string 'Date:'
SUMMARY: AddressSanitizer: global-buffer-overflow wireshark/wiretap/ascendtext.c:105:19 in ascend_seek
Shadow bytes around the buggy address:
0x00008088fea0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x00008088feb0: 00 00 00 00 05 f9 f9 f9 f9 f9 f9 f9 00 00 00 00
0x00008088fec0: 00 00 00 01 f9 f9 f9 f9 00 01 f9 f9 f9 f9 f9 f9
0x00008088fed0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x00008088fee0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
=>0x00008088fef0: 00 00 00 00 00 00 f9 f9 f9 f9 f9 f9[06]f9 f9 f9
0x00008088ff00: f9 f9 f9 f9 00 02 f9 f9 f9 f9 f9 f9 00 01 f9 f9
0x00008088ff10: f9 f9 f9 f9 06 f9 f9 f9 f9 f9 f9 f9 06 f9 f9 f9
0x00008088ff20: f9 f9 f9 f9 06 f9 f9 f9 f9 f9 f9 f9 06 f9 f9 f9
0x00008088ff30: f9 f9 f9 f9 00 f9 f9 f9 f9 f9 f9 f9 07 f9 f9 f9
0x00008088ff40: f9 f9 f9 f9 00 00 01 f9 f9 f9 f9 f9 06 f9 f9 f9
Shadow byte legend (one shadow byte represents 8 application bytes):
Addressable: 00
Partially addressable: 01 02 03 04 05 06 07
Heap left redzone: fa
Heap right redzone: fb
Freed heap region: fd
Stack left redzone: f1
Stack mid redzone: f2
Stack right redzone: f3
Stack partial redzone: f4
Stack after return: f5
Stack use after scope: f8
Global redzone: f9
Global init order: f6
Poisoned by user: f7
Container overflow: fc
Array cookie: ac
Intra object redzone: bb
ASan internal: fe
Left alloca redzone: ca
Right alloca redzone: cb
==5629==ABORTING
--- cut ---
The crash was reported at https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=11794. Attached are three files which trigger the crash.
Proof of Concept:
https://gitlab.com/exploit-database/exploitdb-bin-sploits/-/raw/main/bin-sploits/39001.zipOS impact
Debian Fixed 5 releases
| Version | Status | Fixed in |
|---|---|---|
| trixie | Fixed | 2.0.1+g59ea380-1 |
| sid | Fixed | 2.0.1+g59ea380-1 |
| forky | Fixed | 2.0.1+g59ea380-1 |
| bullseye | Fixed | 2.0.1+g59ea380-1 |
| bookworm | Fixed | 2.0.1+g59ea380-1 |
References
- http://www.debian.org/security/2016/dsa-3505
- http://www.oracle.com/technetwork/topics/security/bulletinjan2016-2867206.html
- http://www.securityfocus.com/bid/79382
- http://www.securitytracker.com/id/1034551
- http://www.wireshark.org/security/wnpa-sec-2015-47.html
- https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=11794
- https://code.wireshark.org/review/gitweb?p=wireshark.git%3Ba=commit%3Bh=338da1c0ea0b2f8595d3a7b6d6c9548f7da3e27b
- https://security.gentoo.org/glsa/201604-05
- https://security-tracker.debian.org/tracker/CVE-2015-8729
CWEs
CWE-20
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.