Multiple vulnerabilities in HAProxy



Risk Medium
Patch available YES
Number of vulnerabilities 3
CVE-ID CVE-2021-39242
CVE-2021-39241
CVE-2021-39240
CWE-ID CWE-20
Exploitation vector Network
Public exploit N/A
Vulnerable software
 HAProxy
Server applications / IDS/IPS systems, Firewalls and proxy servers

Vendor HAProxy

Security Bulletin

This security bulletin contains information about 3 vulnerabilities.

1) Input validation error

EUVDB-ID: #VU55971

Risk: Medium

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2021-39242

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a remote attacker to bypass implemented security restrictions.

The vulnerability exists due to insufficient validation of user-supplied input when processing HTTP headers. A remote attacker can send a specially crafted Host header to the application and bypass implemented security restrictions.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

HAProxy: 2.2.0 - 2.4.2

CPE2.3 External links

https://www.mail-archive.com/haproxy@formilux.org/msg41041.html
https://git.haproxy.org/?p=haproxy.git;a=commit;h=b5d2b9e154d78e4075db163826c5e0f6d31b2ab1


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) Input validation error

EUVDB-ID: #VU55970

Risk: Medium

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2021-39241

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a remote attacker to bypass implemented security restrictions.

The vulnerability exists due to insufficient validation of user-supplied input in HAProxy.  An HTTP method name may contain a space followed by the name of a protected resource. It is possible that a server would interpret this as a request for that protected resource, such as in the "GET /admin? HTTP/1.1 /static/images HTTP/1.1" example.

The attacker can abuse such behavior to bypass implemented security restrictions and perform unauthorized actions against the web application behind the HAProxy.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

HAProxy: 2.0.0 - 2.4.2

CPE2.3 External links

https://www.mail-archive.com/haproxy@formilux.org/msg41041.html
https://git.haproxy.org/?p=haproxy.git;a=commit;h=89265224d314a056d77d974284802c1b8a0dc97f


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) Input validation error

EUVDB-ID: #VU55969

Risk: Medium

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2021-39240

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a remote attacker to bypass security restrictions.

The vulnerability exists due to insufficient validation of user-supplied input when processing HTTP/2 requests. HAProxy does not ensure that the scheme and path portions of a URI have the expected characters, e.g. the authority field on a target HTTP/2 server might differ from what the routing rules were intended to achieve. A remote attacker can send specially crafted input to the application and bypass implemented security restrictions.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

HAProxy: 2.2.0 - 2.4.2

CPE2.3
External links

https://git.haproxy.org/?p=haproxy.git;a=commit;h=a495e0d94876c9d39763db319f609351907a31e8
https://git.haproxy.org/?p=haproxy.git;a=commit;h=4b8852c70d8c4b7e225e24eb58258a15eb54c26e
https://www.mail-archive.com/haproxy@formilux.org/msg41041.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 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.



###SIDEBAR###