Multiple vulnerabilities in TigerVNC



| Updated: 2020-08-19
Risk High
Patch available YES
Number of vulnerabilities 5
CVE-ID CVE-2017-7392
CVE-2017-7393
CVE-2017-7394
CVE-2017-7395
CVE-2017-7396
CWE-ID CWE-401
CWE-415
CWE-20
CWE-190
Exploitation vector Network
Public exploit N/A
Vulnerable software
 TigerVNC
Web applications / Modules and components for CMS

Vendor tigervnc.org

Security Bulletin

This security bulletin contains information about 5 vulnerabilities.

1) Memory leak

EUVDB-ID: #VU39304

Risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2017-7392

CWE-ID: CWE-401 - Missing release of memory after effective lifetime

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to memory leak within the server. A remote attacker can perform a denial of service attack.

Mitigation

Install update from vendor's website.

Vulnerable software versions

TigerVNC: 1.7.1

CPE2.3 External links

https://www.securityfocus.com/bid/97305
https://access.redhat.com/errata/RHSA-2017:2000
https://github.com/TigerVNC/tigervnc/pull/441
https://security.gentoo.org/glsa/201801-13


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

2) Double Free

EUVDB-ID: #VU39305

Risk: High

CVSSv4.0: 6.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2017-7393

CWE-ID: CWE-415 - Double Free

Exploit availability: No

Description

The vulnerability allows a remote authenticated user to execute arbitrary code.

In TigerVNC 1.7.1 (VNCSConnectionST.cxx VNCSConnectionST::fence), an authenticated client can cause a double free, leading to denial of service or potentially code execution.

Mitigation

Install update from vendor's website.

Vulnerable software versions

TigerVNC: 1.7.1

CPE2.3 External links

https://www.securityfocus.com/bid/97305
https://access.redhat.com/errata/RHSA-2017:2000
https://github.com/TigerVNC/tigervnc/pull/438
https://security.gentoo.org/glsa/201801-13


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

3) Input validation error

EUVDB-ID: #VU39306

Risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2017-7394

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a remote non-authenticated attacker to perform a denial of service (DoS) attack.

In TigerVNC 1.7.1 (SSecurityPlain.cxx SSecurityPlain::processMsg), unauthenticated users can crash the server by sending long usernames.

Mitigation

Install update from vendor's website.

Vulnerable software versions

TigerVNC: 1.7.1

CPE2.3 External links

https://www.securityfocus.com/bid/97305
https://access.redhat.com/errata/RHSA-2017:2000
https://github.com/TigerVNC/tigervnc/pull/440
https://security.gentoo.org/glsa/201801-13


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

4) Integer overflow

EUVDB-ID: #VU39307

Risk: Medium

CVSSv4.0: 4.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2017-7395

CWE-ID: CWE-190 - Integer overflow

Exploit availability: No

Description

The vulnerability allows a remote authenticated user to perform a denial of service (DoS) attack.

In TigerVNC 1.7.1 (SMsgReader.cxx SMsgReader::readClientCutText), by causing an integer overflow, an authenticated client can crash the server.

Mitigation

Install update from vendor's website.

Vulnerable software versions

TigerVNC: 1.7.1

CPE2.3 External links

https://www.securityfocus.com/bid/97305
https://access.redhat.com/errata/RHSA-2017:2000
https://github.com/TigerVNC/tigervnc/pull/436
https://github.com/TigerVNC/tigervnc/pull/436/commits/bf3bdac082978ca32895a4b6a123016094905689
https://security.gentoo.org/glsa/201801-13


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

5) Memory leak

EUVDB-ID: #VU39308

Risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2017-7396

CWE-ID: CWE-401 - Missing release of memory after effective lifetime

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to memory leak within the server. A remote attacker can perform a denial of service attack.

Mitigation

Install update from vendor's website.

Vulnerable software versions

TigerVNC: 1.7.1

CPE2.3 External links

https://www.securityfocus.com/bid/97305
https://access.redhat.com/errata/RHSA-2017:2000
https://github.com/TigerVNC/tigervnc/pull/436
https://github.com/TigerVNC/tigervnc/pull/436/commits/dccb5f7d776e93863ae10bbff56a45c523c6eeb0
https://security.gentoo.org/glsa/201801-13


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.



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