Anolis OS update for httpd:2.4 module



| Updated: 2025-03-28
Risk Critical
Patch available YES
Number of vulnerabilities 3
CVE-ID CVE-2021-26691
CVE-2021-40438
CVE-2021-44790
CWE-ID CWE-476
CWE-918
CWE-119
Exploitation vector Network
Public exploit Vulnerability #2 is being exploited in the wild.
Public exploit code for vulnerability #3 is available.
Vulnerable software
 Anolis OS
Operating systems & Components / Operating system

httpd-manual
Operating systems & Components / Operating system package or component

httpd-filesystem
Operating systems & Components / Operating system package or component

mod_ssl
Operating systems & Components / Operating system package or component

mod_session
Operating systems & Components / Operating system package or component

mod_proxy_html
Operating systems & Components / Operating system package or component

mod_md
Operating systems & Components / Operating system package or component

mod_ldap
Operating systems & Components / Operating system package or component

mod_http2
Operating systems & Components / Operating system package or component

httpd-tools
Operating systems & Components / Operating system package or component

httpd-devel
Operating systems & Components / Operating system package or component

httpd
Operating systems & Components / Operating system package or component

Vendor OpenAnolis

Security Bulletin

This security bulletin contains information about 3 vulnerabilities.

1) NULL pointer dereference

EUVDB-ID: #VU53776

Risk: Low

CVSSv4.0: 4.6 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2021-26691

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 mod_session. A a malicious backend server or SessionHeader can trigger a denial of service (DoS) condition.

Mitigation

Install updates from vendor's repository.

Vulnerable software versions

Anolis OS: 8

httpd-manual: before 2.4.37-43.0.1

httpd-filesystem: before 2.4.37-43.0.1

mod_ssl: before 2.4.37-43.0.1

mod_session: before 2.4.37-43.0.1

mod_proxy_html: before 2.4.37-43.0.1

mod_md: before 2.0.8-8

mod_ldap: before 2.4.37-43.0.1

mod_http2: before 1.15.7-3

httpd-tools: before 2.4.37-43.0.1

httpd-devel: before 2.4.37-43.0.1

httpd: before 2.4.37-43.0.1

CPE2.3 External links

https://anas.openanolis.cn/errata/detail/ANSA-2022:0028


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) Server-Side Request Forgery (SSRF)

EUVDB-ID: #VU56678

Risk: High

CVSSv4.0: 8.8 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:N/SC:L/SI:N/SA:N/E:A/U:Amber]

CVE-ID: CVE-2021-40438

CWE-ID: CWE-918 - Server-Side Request Forgery (SSRF)

Exploit availability: Yes

Description

The disclosed vulnerability allows a remote attacker to perform SSRF attacks.

The vulnerability exists due to insufficient validation of user-supplied input within the mod_proxy module in Apache HTTP Server. A remote attacker can send a specially crafted HTTP request with a chosen uri-path and trick the web server to initiate requests to arbitrary systems.

Successful exploitation of this vulnerability may allow a remote attacker gain access to sensitive data, located in the local network or send malicious requests to other servers from the vulnerable system.

Mitigation

Install updates from vendor's repository.

Vulnerable software versions

Anolis OS: 8

httpd-manual: before 2.4.37-43.0.1

httpd-filesystem: before 2.4.37-43.0.1

mod_ssl: before 2.4.37-43.0.1

mod_session: before 2.4.37-43.0.1

mod_proxy_html: before 2.4.37-43.0.1

mod_md: before 2.0.8-8

mod_ldap: before 2.4.37-43.0.1

mod_http2: before 1.15.7-3

httpd-tools: before 2.4.37-43.0.1

httpd-devel: before 2.4.37-43.0.1

httpd: before 2.4.37-43.0.1

CPE2.3 External links

https://anas.openanolis.cn/errata/detail/ANSA-2022:0028


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?

Yes. This vulnerability is being exploited in the wild.

3) Buffer overflow

EUVDB-ID: #VU59056

Risk: Critical

CVSSv4.0: 8.9 [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:P/U:Red]

CVE-ID: CVE-2021-44790

CWE-ID: CWE-119 - Memory corruption

Exploit availability: Yes

Description

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

The vulnerability exists due to a boundary error when parsing multipart content in mod_lua. A remote attacker can send a specially crafted HTTP request to the affected web server, trigger buffer overflow and execute arbitrary code on the target system.

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

Mitigation

Install updates from vendor's repository.

Vulnerable software versions

Anolis OS: 8

httpd-manual: before 2.4.37-43.0.1

httpd-filesystem: before 2.4.37-43.0.1

mod_ssl: before 2.4.37-43.0.1

mod_session: before 2.4.37-43.0.1

mod_proxy_html: before 2.4.37-43.0.1

mod_md: before 2.0.8-8

mod_ldap: before 2.4.37-43.0.1

mod_http2: before 1.15.7-3

httpd-tools: before 2.4.37-43.0.1

httpd-devel: before 2.4.37-43.0.1

httpd: before 2.4.37-43.0.1

CPE2.3 External links

https://anas.openanolis.cn/errata/detail/ANSA-2022:0028


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. However, proof of concept for this vulnerability is available.



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