LibVNCServer up to 0.9.12 libvncserver/ws_decode.c hybiReadAndDecode memory corruption

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CVSS Meta Temp Score
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A vulnerability was found in LibVNCServer up to 0.9.12. It has been rated as problematic. This issue affects the function hybiReadAndDecode of the file libvncserver/ws_decode.c. The manipulation with an unknown input leads to a memory corruption vulnerability. Using CWE to declare the problem leads to CWE-119. Impacted is availability. The summary by CVE is:

An issue was discovered in LibVNCServer before 0.9.13. libvncserver/ws_decode.c can lead to a crash because of unaligned accesses in hybiReadAndDecode.

The weakness was presented 06/17/2020. The identification of this vulnerability is CVE-2019-20840 since 06/17/2020. The exploitation is known to be easy. 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.

Upgrading to version 0.9.13 eliminates this vulnerability.

See 156832 and 156830 for similar entries.

Productinfoedit

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CPE 2.3infoedit

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CVSSv3infoedit

VulDB Meta Base Score: 6.4
VulDB Meta Temp Score: 6.1

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 7.5
NVD Vector: 🔒

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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

NVD Base Score: 🔒

Exploitinginfoedit

Class: Memory corruption
CWE: CWE-119
ATT&CK: Unknown

Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfoedit

Threat: 🔍
Adversaries: 🔍
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Countermeasuresinfoedit

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: LibVNCServer 0.9.13

Timelineinfoedit

06/17/2020 Advisory disclosed
06/17/2020 +0 days CVE assigned
06/18/2020 +1 days VulDB entry created
06/18/2020 +0 days VulDB last update

Sourcesinfoedit

Status: Not defined

CVE: CVE-2019-20840 (🔒)
See also: 🔒

Entryinfoedit

Created: 06/18/2020 06:55 AM
Changes: (17) vulnerability_cwe vulnerability_cvss2_nvd_av vulnerability_cvss2_nvd_ac vulnerability_cvss2_nvd_au vulnerability_cvss2_nvd_ci vulnerability_cvss2_nvd_ii vulnerability_cvss2_nvd_ai vulnerability_cvss3_nvd_av vulnerability_cvss3_nvd_ac vulnerability_cvss3_nvd_pr vulnerability_cvss3_nvd_ui vulnerability_cvss3_nvd_s vulnerability_cvss3_nvd_c vulnerability_cvss3_nvd_i vulnerability_cvss3_nvd_a source_cve_assigned source_cve_nvd_summary
Complete: 🔍

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