LibVNCServer up to 0.9.11 WebSocket Frame websockets.c out-of-bounds write
CVSS Meta Temp Score | Current Exploit Price (≈) | CTI Interest Score |
---|---|---|
9.6 | $0-$5k | 0.00 |
A vulnerability was found in LibVNCServer up to 0.9.11 and classified as very critical. This issue affects some unknown processing of the file websockets.c of the component WebSocket Frame Handler. The manipulation with an unknown input leads to a out-of-bounds write vulnerability. Using CWE to declare the problem leads to CWE-787. The product writes data past the end, or before the beginning, of the intended buffer. Impacted is confidentiality, integrity, and availability. The summary by CVE is:
It was discovered that websockets.c in LibVNCServer prior to 0.9.12 did not properly decode certain WebSocket frames. A malicious attacker could exploit this by sending specially crafted WebSocket frames to a server, causing a heap-based buffer overflow.
The weakness was presented 04/22/2023. The advisory is shared at github.com. The identification of this vulnerability is CVE-2017-18922 since 06/30/2020. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details are known, but no exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 04/22/2023).
Upgrading to version 0.9.12 eliminates this vulnerability. Applying the patch aac95a9dcf4bbba87b76c72706c3221a842ca433 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.
See VDB-144419, VDB-144420 and VDB-154302 for similar entries.
Product
Name
Version
License
CPE 2.3
CPE 2.2
CVSSv4
VulDB CVSS-B Score: 🔍VulDB CVSS-BT Score: 🔍
VulDB Vector: 🔍
VulDB Reliability: 🔍
CVSSv3
VulDB Meta Base Score: 9.8VulDB Meta Temp Score: 9.6
VulDB Base Score: 9.8
VulDB Temp Score: 9.4
VulDB Vector: 🔍
VulDB Reliability: 🔍
NVD Base Score: 9.8
NVD Vector: 🔍
CVSSv2
AV | AC | Au | C | I | A |
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Vector | Complexity | Authentication | Confidentiality | Integrity | Availability |
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unlock | unlock | unlock | unlock | unlock | unlock |
unlock | unlock | unlock | unlock | unlock | unlock |
unlock | unlock | unlock | unlock | unlock | unlock |
VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍
NVD Base Score: 🔍
Exploiting
Class: Out-of-bounds writeCWE: CWE-787 / CWE-119
CAPEC: 🔍
ATT&CK: 🔍
Local: No
Remote: Yes
Availability: 🔍
Status: Not defined
EPSS Score: 🔍
EPSS Percentile: 🔍
Price Prediction: 🔍
Current Price Estimation: 🔍
0-Day | unlock | unlock | unlock | unlock |
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Today | unlock | unlock | unlock | unlock |
Threat Intelligence
Interest: 🔍Active Actors: 🔍
Active APT Groups: 🔍
Countermeasures
Recommended: UpgradeStatus: 🔍
0-Day Time: 🔍
Upgrade: LibVNCServer 0.9.12
Patch: aac95a9dcf4bbba87b76c72706c3221a842ca433
Timeline
06/30/2020 🔍04/21/2023 🔍
04/22/2023 🔍
05/15/2023 🔍
Sources
Advisory: USN-4407-1Status: Confirmed
Confirmation: 🔍
CVE: CVE-2017-18922 (🔍)
See also: 🔍
Entry
Created: 04/22/2023 00:54Updated: 05/15/2023 16:32
Changes: 04/22/2023 00:54 (59), 05/15/2023 16:32 (1)
Complete: 🔍
Cache ID: 3:B3E:103
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