Amazon Linux AMI update for httpd24

1) Security restrictions bypass

EUVDB-ID: #VU53780

Risk: Medium

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

CVE-ID: CVE-2019-17567

CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls

Exploit availability: No

Description

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

The vulnerability exists due to unspecified error within the mod_proxy_wstunnel and mod_proxy_http modules. If mod_proxy_wstunnel is configured on an URL that is not necessarily Upgraded by the origin server and is tunneling the whole connection regardless, thus allowing for subsequent requests on the same connection to pass through with no HTTP validation, authentication or authorization possibly configured.

Mitigation

Update the affected packages:

i686:
    mod24_session-2.4.48-1.92.amzn1.i686
    mod24_ssl-2.4.48-1.92.amzn1.i686
    mod24_proxy_html-2.4.48-1.92.amzn1.i686
    mod24_md-2.4.48-1.92.amzn1.i686
    httpd24-devel-2.4.48-1.92.amzn1.i686
    httpd24-2.4.48-1.92.amzn1.i686
    httpd24-tools-2.4.48-1.92.amzn1.i686
    httpd24-debuginfo-2.4.48-1.92.amzn1.i686
    mod24_ldap-2.4.48-1.92.amzn1.i686

noarch:
    httpd24-manual-2.4.48-1.92.amzn1.noarch

src:
    httpd24-2.4.48-1.92.amzn1.src

x86_64:
    mod24_proxy_html-2.4.48-1.92.amzn1.x86_64
    mod24_ldap-2.4.48-1.92.amzn1.x86_64
    httpd24-devel-2.4.48-1.92.amzn1.x86_64
    httpd24-2.4.48-1.92.amzn1.x86_64
    httpd24-tools-2.4.48-1.92.amzn1.x86_64
    httpd24-debuginfo-2.4.48-1.92.amzn1.x86_64
    mod24_md-2.4.48-1.92.amzn1.x86_64
    mod24_session-2.4.48-1.92.amzn1.x86_64
    mod24_ssl-2.4.48-1.92.amzn1.x86_64

Vulnerable software versions

Amazon Linux AMI: All versions

CPE2.3

cpe:2.3:o:amazon_web_services:amazon_linux_ami:*:*:*:*:*:*:*:*

External links

https://alas.aws.amazon.com/ALAS-2021-1514.html

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) Improper Privilege Management

EUVDB-ID: #VU53779

Risk: Low

CVSSv4.0: 4.3 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2020-13938

CWE-ID: CWE-269 - Improper Privilege Management

Exploit availability: No

Description

The vulnerability allows a local user to stop the service.

The vulnerability exists due to improper privilege management. A local user can on the Windows system can stop the Apache HTTP server service.

Mitigation

Update the affected packages:

i686:
    mod24_session-2.4.48-1.92.amzn1.i686
    mod24_ssl-2.4.48-1.92.amzn1.i686
    mod24_proxy_html-2.4.48-1.92.amzn1.i686
    mod24_md-2.4.48-1.92.amzn1.i686
    httpd24-devel-2.4.48-1.92.amzn1.i686
    httpd24-2.4.48-1.92.amzn1.i686
    httpd24-tools-2.4.48-1.92.amzn1.i686
    httpd24-debuginfo-2.4.48-1.92.amzn1.i686
    mod24_ldap-2.4.48-1.92.amzn1.i686

noarch:
    httpd24-manual-2.4.48-1.92.amzn1.noarch

src:
    httpd24-2.4.48-1.92.amzn1.src

x86_64:
    mod24_proxy_html-2.4.48-1.92.amzn1.x86_64
    mod24_ldap-2.4.48-1.92.amzn1.x86_64
    httpd24-devel-2.4.48-1.92.amzn1.x86_64
    httpd24-2.4.48-1.92.amzn1.x86_64
    httpd24-tools-2.4.48-1.92.amzn1.x86_64
    httpd24-debuginfo-2.4.48-1.92.amzn1.x86_64
    mod24_md-2.4.48-1.92.amzn1.x86_64
    mod24_session-2.4.48-1.92.amzn1.x86_64
    mod24_ssl-2.4.48-1.92.amzn1.x86_64

Vulnerable software versions

Amazon Linux AMI: All versions

CPE2.3

cpe:2.3:o:amazon_web_services:amazon_linux_ami:*:*:*:*:*:*:*:*

External links

https://alas.aws.amazon.com/ALAS-2021-1514.html

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

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

3) NULL pointer dereference

EUVDB-ID: #VU53778

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-2020-13950

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_proxy_http. A remote attacker can pass specially crafted data to the application and perform a denial of service (DoS) attack.

Mitigation

Update the affected packages:

i686:
    mod24_session-2.4.48-1.92.amzn1.i686
    mod24_ssl-2.4.48-1.92.amzn1.i686
    mod24_proxy_html-2.4.48-1.92.amzn1.i686
    mod24_md-2.4.48-1.92.amzn1.i686
    httpd24-devel-2.4.48-1.92.amzn1.i686
    httpd24-2.4.48-1.92.amzn1.i686
    httpd24-tools-2.4.48-1.92.amzn1.i686
    httpd24-debuginfo-2.4.48-1.92.amzn1.i686
    mod24_ldap-2.4.48-1.92.amzn1.i686

noarch:
    httpd24-manual-2.4.48-1.92.amzn1.noarch

src:
    httpd24-2.4.48-1.92.amzn1.src

x86_64:
    mod24_proxy_html-2.4.48-1.92.amzn1.x86_64
    mod24_ldap-2.4.48-1.92.amzn1.x86_64
    httpd24-devel-2.4.48-1.92.amzn1.x86_64
    httpd24-2.4.48-1.92.amzn1.x86_64
    httpd24-tools-2.4.48-1.92.amzn1.x86_64
    httpd24-debuginfo-2.4.48-1.92.amzn1.x86_64
    mod24_md-2.4.48-1.92.amzn1.x86_64
    mod24_session-2.4.48-1.92.amzn1.x86_64
    mod24_ssl-2.4.48-1.92.amzn1.x86_64

Vulnerable software versions

Amazon Linux AMI: All versions

CPE2.3

cpe:2.3:o:amazon_web_services:amazon_linux_ami:*:*:*:*:*:*:*:*

External links

https://alas.aws.amazon.com/ALAS-2021-1514.html

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.

4) Stack-based buffer overflow

EUVDB-ID: #VU53775

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-2020-35452

CWE-ID: CWE-121 - Stack-based 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 when processing Digest nounces in mod_auth_digest. A remote unauthenticated attacker can send a specially crafted HTTP request, trigger stack overflow by one nul byte and crash the server.

Mitigation

Update the affected packages:

i686:
    mod24_session-2.4.48-1.92.amzn1.i686
    mod24_ssl-2.4.48-1.92.amzn1.i686
    mod24_proxy_html-2.4.48-1.92.amzn1.i686
    mod24_md-2.4.48-1.92.amzn1.i686
    httpd24-devel-2.4.48-1.92.amzn1.i686
    httpd24-2.4.48-1.92.amzn1.i686
    httpd24-tools-2.4.48-1.92.amzn1.i686
    httpd24-debuginfo-2.4.48-1.92.amzn1.i686
    mod24_ldap-2.4.48-1.92.amzn1.i686

noarch:
    httpd24-manual-2.4.48-1.92.amzn1.noarch

src:
    httpd24-2.4.48-1.92.amzn1.src

x86_64:
    mod24_proxy_html-2.4.48-1.92.amzn1.x86_64
    mod24_ldap-2.4.48-1.92.amzn1.x86_64
    httpd24-devel-2.4.48-1.92.amzn1.x86_64
    httpd24-2.4.48-1.92.amzn1.x86_64
    httpd24-tools-2.4.48-1.92.amzn1.x86_64
    httpd24-debuginfo-2.4.48-1.92.amzn1.x86_64
    mod24_md-2.4.48-1.92.amzn1.x86_64
    mod24_session-2.4.48-1.92.amzn1.x86_64
    mod24_ssl-2.4.48-1.92.amzn1.x86_64

Vulnerable software versions

Amazon Linux AMI: All versions

CPE2.3

cpe:2.3:o:amazon_web_services:amazon_linux_ami:*:*:*:*:*:*:*:*

External links

https://alas.aws.amazon.com/ALAS-2021-1514.html

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.

5) NULL pointer dereference

EUVDB-ID: #VU53777

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-2021-26690

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 remote attacker can pass specially crafted data to the application and perform a denial of service (DoS) attack.

Mitigation

Update the affected packages:

i686:
    mod24_session-2.4.48-1.92.amzn1.i686
    mod24_ssl-2.4.48-1.92.amzn1.i686
    mod24_proxy_html-2.4.48-1.92.amzn1.i686
    mod24_md-2.4.48-1.92.amzn1.i686
    httpd24-devel-2.4.48-1.92.amzn1.i686
    httpd24-2.4.48-1.92.amzn1.i686
    httpd24-tools-2.4.48-1.92.amzn1.i686
    httpd24-debuginfo-2.4.48-1.92.amzn1.i686
    mod24_ldap-2.4.48-1.92.amzn1.i686

noarch:
    httpd24-manual-2.4.48-1.92.amzn1.noarch

src:
    httpd24-2.4.48-1.92.amzn1.src

x86_64:
    mod24_proxy_html-2.4.48-1.92.amzn1.x86_64
    mod24_ldap-2.4.48-1.92.amzn1.x86_64
    httpd24-devel-2.4.48-1.92.amzn1.x86_64
    httpd24-2.4.48-1.92.amzn1.x86_64
    httpd24-tools-2.4.48-1.92.amzn1.x86_64
    httpd24-debuginfo-2.4.48-1.92.amzn1.x86_64
    mod24_md-2.4.48-1.92.amzn1.x86_64
    mod24_session-2.4.48-1.92.amzn1.x86_64
    mod24_ssl-2.4.48-1.92.amzn1.x86_64

Vulnerable software versions

Amazon Linux AMI: All versions

CPE2.3

cpe:2.3:o:amazon_web_services:amazon_linux_ami:*:*:*:*:*:*:*:*

External links

https://alas.aws.amazon.com/ALAS-2021-1514.html

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.

6) 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

Update the affected packages:

i686:
    mod24_session-2.4.48-1.92.amzn1.i686
    mod24_ssl-2.4.48-1.92.amzn1.i686
    mod24_proxy_html-2.4.48-1.92.amzn1.i686
    mod24_md-2.4.48-1.92.amzn1.i686
    httpd24-devel-2.4.48-1.92.amzn1.i686
    httpd24-2.4.48-1.92.amzn1.i686
    httpd24-tools-2.4.48-1.92.amzn1.i686
    httpd24-debuginfo-2.4.48-1.92.amzn1.i686
    mod24_ldap-2.4.48-1.92.amzn1.i686

noarch:
    httpd24-manual-2.4.48-1.92.amzn1.noarch

src:
    httpd24-2.4.48-1.92.amzn1.src

x86_64:
    mod24_proxy_html-2.4.48-1.92.amzn1.x86_64
    mod24_ldap-2.4.48-1.92.amzn1.x86_64
    httpd24-devel-2.4.48-1.92.amzn1.x86_64
    httpd24-2.4.48-1.92.amzn1.x86_64
    httpd24-tools-2.4.48-1.92.amzn1.x86_64
    httpd24-debuginfo-2.4.48-1.92.amzn1.x86_64
    mod24_md-2.4.48-1.92.amzn1.x86_64
    mod24_session-2.4.48-1.92.amzn1.x86_64
    mod24_ssl-2.4.48-1.92.amzn1.x86_64

Vulnerable software versions

Amazon Linux AMI: All versions

CPE2.3

cpe:2.3:o:amazon_web_services:amazon_linux_ami:*:*:*:*:*:*:*:*

External links

https://alas.aws.amazon.com/ALAS-2021-1514.html

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.

7) Input validation error

EUVDB-ID: #VU53774

Risk: Medium

CVSSv4.0: 6.9 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2021-30641

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 incorrect parsing of Apache configuration files. An unexpected section could be matched with 'MergeSlashes OFF' option, leading to a potential security issue.

Mitigation

Update the affected packages:

i686:
    mod24_session-2.4.48-1.92.amzn1.i686
    mod24_ssl-2.4.48-1.92.amzn1.i686
    mod24_proxy_html-2.4.48-1.92.amzn1.i686
    mod24_md-2.4.48-1.92.amzn1.i686
    httpd24-devel-2.4.48-1.92.amzn1.i686
    httpd24-2.4.48-1.92.amzn1.i686
    httpd24-tools-2.4.48-1.92.amzn1.i686
    httpd24-debuginfo-2.4.48-1.92.amzn1.i686
    mod24_ldap-2.4.48-1.92.amzn1.i686

noarch:
    httpd24-manual-2.4.48-1.92.amzn1.noarch

src:
    httpd24-2.4.48-1.92.amzn1.src

x86_64:
    mod24_proxy_html-2.4.48-1.92.amzn1.x86_64
    mod24_ldap-2.4.48-1.92.amzn1.x86_64
    httpd24-devel-2.4.48-1.92.amzn1.x86_64
    httpd24-2.4.48-1.92.amzn1.x86_64
    httpd24-tools-2.4.48-1.92.amzn1.x86_64
    httpd24-debuginfo-2.4.48-1.92.amzn1.x86_64
    mod24_md-2.4.48-1.92.amzn1.x86_64
    mod24_session-2.4.48-1.92.amzn1.x86_64
    mod24_ssl-2.4.48-1.92.amzn1.x86_64

Vulnerable software versions

Amazon Linux AMI: All versions

CPE2.3

cpe:2.3:o:amazon_web_services:amazon_linux_ami:*:*:*:*:*:*:*:*

External links

https://alas.aws.amazon.com/ALAS-2021-1514.html

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	7
CVE-ID	CVE-2019-17567 CVE-2020-13938 CVE-2020-13950 CVE-2020-35452 CVE-2021-26690 CVE-2021-26691 CVE-2021-30641
CWE-ID	CWE-264 CWE-269 CWE-476 CWE-121 CWE-20
Exploitation vector	Network
Public exploit	N/A
Vulnerable software	Amazon Linux AMI Operating systems & Components / Operating system
Vendor	Amazon Web Services