Multiple vulnerabilities in NetHack

1) Buffer overflow

EUVDB-ID: #VU24926

Risk: High

CVSSv3.1: 8.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-5214

CWE-ID: CWE-119 - Memory corruption

Exploit availability: No

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to a boundary error when detecting an unknown configuration file option. A remote attacker can trigger memory corruption, cause a denial of service (DoS) condition or execute arbitrary code on the target system with elevated privileges.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Note: This vulnerability affects systems that have NetHack installed suid/sgid and shared systems that allow users to upload their own configuration files.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

NetHack: 3.6.0 - 3.6.4

CPE2.3

External links

http://github.com/NetHack/NetHack/security/advisories/GHSA-p8fw-rq89-xqx6
http://nethack.org/security/CVE-2020-5214.html

Q & A

Can this vulnerability be exploited remotely?

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

How the attacker can exploit this vulnerability?

The attacker would have to trick the victim to open a a specially crafted file.

Is there known malware, which exploits this vulnerability?

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

2) Buffer overflow

EUVDB-ID: #VU24925

Risk: High

CVSSv3.1: 8.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-5213

CWE-ID: CWE-119 - Memory corruption

Exploit availability: No

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to a boundary error in an extremely long value for the SYMBOL configuration file options. A remote attacker can trigger memory corruption, cause a denial of service (DoS) condition or execute arbitrary code on the target system with elevated privileges.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Note: This vulnerability affects systems that have NetHack installed suid/sgid and shared systems that allow users to upload their own configuration files.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

NetHack: 3.6.0 - 3.6.4

CPE2.3

External links

http://github.com/NetHack/NetHack/security/advisories/GHSA-rr25-4v34-pr7v
http://nethack.org/security/CVE-2020-5213.html

Q & A

Can this vulnerability be exploited remotely?

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

How the attacker can exploit this vulnerability?

The attacker would have to trick the victim to open a a specially crafted file.

Is there known malware, which exploits this vulnerability?

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

3) Buffer overflow

EUVDB-ID: #VU24924

Risk: High

CVSSv3.1: 8.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-5212

CWE-ID: CWE-119 - Memory corruption

Exploit availability: No

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to a boundary error in an extremely long value for the MENUCOLOR configuration file option. A remote attacker can trigger memory corruption, cause a denial of service (DoS) condition or execute arbitrary code on the target system with elevated privileges.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Note: This vulnerability affects systems that have NetHack installed suid/sgid and shared systems that allow users to upload their own configuration files.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

NetHack: 3.6.0 - 3.6.4

CPE2.3

External links

http://github.com/NetHack/NetHack/security/advisories/GHSA-g89f-m829-4m56
http://nethack.org/security/CVE-2020-5212.html

Q & A

Can this vulnerability be exploited remotely?

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

How the attacker can exploit this vulnerability?

The attacker would have to trick the victim to open a a specially crafted file.

Is there known malware, which exploits this vulnerability?

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

4) Buffer overflow

EUVDB-ID: #VU24923

Risk: High

CVSSv3.1: 8.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-5210

CWE-ID: CWE-119 - Memory corruption

Exploit availability: No

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to a boundary error in an invalid argument to the -w command line option. A remote attacker can trigger memory corruption, cause a denial of service (DoS) condition or execute arbitrary code on the target system with elevated privileges.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Note: This vulnerability affects systems that have NetHack installed suid/sgid and shared systems that allow users to influence command line options.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

NetHack: 3.6.0 - 3.6.4

CPE2.3

External links

http://github.com/NetHack/NetHack/commit/f3def5c0b999478da2d0a8f0b6a7c370a2065f77
http://github.com/NetHack/NetHack/security/advisories/GHSA-v5pg-hpjg-9rpp
http://nethack.org/security/CVE-2020-5210.html

Q & A

Can this vulnerability be exploited remotely?

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

How the attacker can exploit this vulnerability?

The attacker would have to trick the victim to open a a specially crafted file.

Is there known malware, which exploits this vulnerability?

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

5) Buffer overflow

EUVDB-ID: #VU24922

Risk: High

CVSSv3.1: 8.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-5209

CWE-ID: CWE-119 - Memory corruption

Exploit availability: No

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to a boundary error when unknown options starting with -de and -i. A remote attacker can trigger memory corruption and cause a denial of service (DoS) condition or execute arbitrary code on the target system with elevated privileges.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Note: This vulnerability affects systems that have NetHack installed suid/sgid and shared systems that allow users to influence command line options.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

NetHack: 3.2.3 - 3.6.4

CPE2.3

External links

http://github.com/NetHack/NetHack/commit/f3def5c0b999478da2d0a8f0b6a7c370a2065f77
http://github.com/NetHack/NetHack/security/advisories/GHSA-fw72-r8xm-45p8
http://nethack.org/security/CVE-2020-5209.html

Q & A

Can this vulnerability be exploited remotely?

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

How the attacker can exploit this vulnerability?

The attacker would have to trick the victim to open a a specially crafted file.

Is there known malware, which exploits this vulnerability?

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

6) Buffer overflow

EUVDB-ID: #VU24920

Risk: High

CVSSv3.1: 8.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-5211

CWE-ID: CWE-119 - Memory corruption

Exploit availability: No

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to a boundary error in an invalid extended command in value for the AUTOCOMPLETE configuration file option. A remote attacker can trigger memory corruption, cause a denial of service (DoS) condition or execute arbitrary code on the target system with elevated privileges.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Note: This vulnerability affects systems that have NetHack installed suid/sgid and shared systems that allow users to upload their own configuration files.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

NetHack: 3.2.3 - 3.6.4

CPE2.3

External links

http://github.com/NetHack/NetHack/security/advisories/GHSA-r788-4jf4-r9f7

Q & A

Can this vulnerability be exploited remotely?

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

How the attacker can exploit this vulnerability?

The attacker would have to trick the victim to open a a specially crafted file.

Is there known malware, which exploits this vulnerability?

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

Risk	High
Patch available	YES
Number of vulnerabilities	6
CVE-ID	CVE-2020-5214 CVE-2020-5213 CVE-2020-5212 CVE-2020-5210 CVE-2020-5209 CVE-2020-5211
CWE-ID	CWE-119
Exploitation vector	Network
Public exploit	N/A
Vulnerable software	NetHack Client/Desktop applications / Games
Vendor	The NetHack DevTeam