Multiple vulnerabilities in Cherokee-project Cherokee webserver

Published: 2019-07-22 | Updated: 2020-12-28

Risk	High
Patch available	NO
Number of vulnerabilities	5
CVE-ID	CVE-2019-1010218 CVE-2020-12845 CVE-2019-20800 CVE-2019-20799 CVE-2019-20798
CWE-ID	CWE-120 CWE-476 CWE-787 CWE-119 CWE-79
Exploitation vector	Network
Public exploit	Public exploit code for vulnerability #5 is available.
Vulnerable software	Cherokee webserver Server applications / Web servers
Vendor	Cherokee-project

Security Bulletin

This security bulletin contains information about 5 vulnerabilities.

Updated: 28.12.2020

Added vulnerabilities #2-5, raised bulletin risk level from medium to high.

1) Buffer overflow

EUVDB-ID: #VU19366

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-2019-1010218

CWE-ID: CWE-120 - Buffer overflow

Exploit availability: No

Description

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

The vulnerability exists due to a boundary error in the main cherokee command. A remote attacker can overwrite argv[0] to an insane length with execl, trigger buffer overflow and crash the application.

Mitigation

Cybersecurity Help is currently unaware of any official solution to address this vulnerability.

Vulnerable software versions

Cherokee webserver: 1.0.12 - 1.2.104

CPE2.3

External links

https://i.imgur.com/PWCCyir.png

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 send a specially crafted request to the affected application in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

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

2) NULL pointer dereference

EUVDB-ID: #VU49164

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-2020-12845

CWE-ID: CWE-476 - NULL Pointer Dereference

Exploit availability: No

Description

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

The vulnerability exists due to a NULL pointer dereference error in cherokee_validator_parse_basic or cherokee_validator_parse_digest. A remote attacker can send a specially crafted HTTP request and perform a denial of service (DoS) attack.

Mitigation

Cybersecurity Help is currently unaware of any official solution to address this vulnerability..

Vulnerable software versions

Cherokee webserver: 0.4.27 - 1.2.104

CPE2.3

External links

https://cherokee-project.com/downloads.html
https://github.com/cherokee/webserver/issues/1242
https://github.com/cherokee/webserver/releases
https://security.gentoo.org/glsa/202012-09

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 send a specially crafted request to the affected application in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

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

3) Out-of-bounds write

EUVDB-ID: #VU49163

Risk: High

CVSSv4.0: 8.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2019-20800

CWE-ID: CWE-787 - Out-of-bounds write

Exploit availability: No

Description

The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to a boundary error when processing untrusted input within the cherokee_handler_cgi_add_env_pair() function in handler_cgi.c. A remote attacker can send a specially crafted HTTP GET request with multiple headers to the server, trigger out-of-bounds write and execute arbitrary code on the target system.

Mitigation

Cybersecurity Help is currently unaware of any official solution to address this vulnerability.

Vulnerable software versions

Cherokee webserver: 1.0.12 - 1.2.104

CPE2.3

External links

https://github.com/cherokee/webserver/issues/1224
https://logicaltrust.net/blog/2019/11/cherokee.html
https://security.gentoo.org/glsa/202012-09

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 send a specially crafted request to the affected application in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

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

4) Buffer overflow

EUVDB-ID: #VU49162

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-2019-20799

CWE-ID: CWE-119 - Memory corruption

Exploit availability: No

Description

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

The vulnerability exists due to a boundary error when processing HTTP requests. A remote attacker can create a specially crafted HTTP request to the server and perform a denial of service (DoS) attack.

Mitigation

Cybersecurity Help is currently unaware of any official solution to address this vulnerability.

Vulnerable software versions

Cherokee webserver: 1.0.12 - 1.2.104

CPE2.3

External links

https://github.com/cherokee/webserver/issues/1221
https://github.com/cherokee/webserver/issues/1222
https://github.com/cherokee/webserver/issues/1225
https://github.com/cherokee/webserver/issues/1226
https://logicaltrust.net/blog/2019/11/cherokee.html
https://security.gentoo.org/glsa/202012-09

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 send a specially crafted request to the affected application in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

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

5) Cross-site scripting

EUVDB-ID: #VU49161

Risk: Medium

CVSSv4.0: 2 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:P/U:Green]

CVE-ID: CVE-2019-20798

CWE-ID: CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Exploit availability: No

Description

The disclosed vulnerability allows a remote attacker to perform cross-site scripting (XSS) attacks.

The vulnerability exists in handler_server_info.c due to insufficient sanitization of user-supplied data passed to the About page in the default configuration of the web server and its administrator panel. A remote attacker can trick the victim to follow a specially crafted link and execute arbitrary HTML and script code in user's browser in context of vulnerable website.

Successful exploitation of this vulnerability may allow a remote attacker to steal potentially sensitive information, change appearance of the web page, perform phishing and drive-by-download attacks.

Example:

http://[host]/about/"><script>alert(1)</script>
http://[host]:9090/about/"><script>alert(1)</script>

Mitigation

Cybersecurity Help is currently unaware of any official solution to address this vulnerability.

Vulnerable software versions

Cherokee webserver: 1.0.12 - 1.2.104

CPE2.3

External links

https://github.com/cherokee/webserver/issues/1227
https://logicaltrust.net/blog/2019/11/cherokee.html
https://security.gentoo.org/glsa/202012-09

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 send a specially crafted request to the affected application in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.