Multiple vulnerabilities in IBM i

1) Improper Authentication

EUVDB-ID: #VU64089

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-2022-31813

CWE-ID: CWE-287 - Improper Authentication

Exploit availability: No

Description

The vulnerability allows a remote attacker to bypass authentication process.

The vulnerability exists due to an error in mod_proxy implementation, where the web server may not send the X-Forwarded-* headers to the origin server based on client side Connection header hop-by-hop mechanism. A remote attacker can bypass IP based authentication on the origin server/application and gain access to otherwise restricted functionality.

Mitigation

Install update from vendor's website.

Vulnerable software versions

IBM i: 7.2 - 7.5

CPE2.3

External links

https://www.ibm.com/blogs/psirt/security-bulletin-ibm-http-server-powered-by-apache-for-ibm-i-is-vulnerable-to-bypass-security-restrictions-and-obtain-sensitive-information-due-to-multiple-vulnerabilities/
https://www.ibm.com/support/pages/node/6607876

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) Out-of-bounds read

EUVDB-ID: #VU64081

Risk: Low

CVSSv4.0: 1.7 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2022-28614

CWE-ID: CWE-125 - Out-of-bounds read

Exploit availability: No

Description

The vulnerability allows a remote attacker to gain access to potentially sensitive information.

The vulnerability exists due to a boundary condition within the ap_rwrite() function. A remote attacker can with the ability to force the server to reflect a very large input using ap_rwrite() or ap_rputs() (such as with mod_luas r:puts() function) can trigger an out-of-bounds read error and read read unintended memory on the system.

Mitigation

Install update from vendor's website.

Vulnerable software versions

IBM i: 7.2 - 7.5

CPE2.3

External links

https://www.ibm.com/blogs/psirt/security-bulletin-ibm-http-server-powered-by-apache-for-ibm-i-is-vulnerable-to-bypass-security-restrictions-and-obtain-sensitive-information-due-to-multiple-vulnerabilities/
https://www.ibm.com/support/pages/node/6607876

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.

3) Out-of-bounds read

EUVDB-ID: #VU64083

Risk: Low

CVSSv4.0: 1.7 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2022-28615

CWE-ID: CWE-125 - Out-of-bounds read

Exploit availability: No

Description

The vulnerability allows a remote attacker to gain access to potentially sensitive information.

The vulnerability exists due to a boundary condition within the ap_strcmp_match() function when processing an extremely large input buffer. A remote attacker can send a specially crafted HTTP request to the web server, trigger an out-of-bounds read error and read contents of memory on the system.

Note, the code distributed with the Apache HTTP Server cannot be coerced into such a call. The vulnerability can affect third-party modules or lua scripts that use ap_strcmp_match().

Mitigation

Install update from vendor's website.

Vulnerable software versions

IBM i: 7.2 - 7.5

CPE2.3

External links

https://www.ibm.com/blogs/psirt/security-bulletin-ibm-http-server-powered-by-apache-for-ibm-i-is-vulnerable-to-bypass-security-restrictions-and-obtain-sensitive-information-due-to-multiple-vulnerabilities/
https://www.ibm.com/support/pages/node/6607876

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.

Risk	Medium
Patch available	YES
Number of vulnerabilities	3
CVE-ID	CVE-2022-31813 CVE-2022-28614 CVE-2022-28615
CWE-ID	CWE-287 CWE-125
Exploitation vector	Network
Public exploit	N/A
Vulnerable software	IBM i Operating systems & Components / Operating system
Vendor	IBM Corporation