Ubuntu update for apache2



Published: 2021-06-21
Risk Medium
Patch available YES
Number of vulnerabilities 5
CVE-ID CVE-2020-13950
CVE-2020-35452
CVE-2021-26690
CVE-2021-26691
CVE-2021-30641
CWE-ID CWE-476
CWE-121
CWE-20
Exploitation vector Network
Public exploit N/A
Vulnerable software
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Ubuntu
Operating systems & Components / Operating system

apache2-bin (Ubuntu package)
Operating systems & Components / Operating system package or component

apache2 (Ubuntu package)
Operating systems & Components / Operating system package or component

Vendor Canonical Ltd.

Security Bulletin

This security bulletin contains information about 5 vulnerabilities.

1) NULL pointer dereference

EUVDB-ID: #VU53778

Risk: Medium

CVSSv3.1:

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 package apache2 to the latest version.

Vulnerable software versions

Ubuntu: 20.10, 21.04, 20.04, 18.04

apache2-bin (Ubuntu package): before 2.4.41-4ubuntu3.3

apache2 (Ubuntu package): before 2.4.41-4ubuntu3.3


CPE2.3 External links

http://ubuntu.com/security/notices/USN-4994-1

Q & A

Can this vulnerability be exploited remotely?

Is there known malware, which exploits this vulnerability?

2) Stack-based buffer overflow

EUVDB-ID: #VU53775

Risk: Medium

CVSSv3.1:

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 package apache2 to the latest version.

Vulnerable software versions

Ubuntu: 20.10, 21.04, 20.04, 18.04

apache2-bin (Ubuntu package): before 2.4.41-4ubuntu3.3

apache2 (Ubuntu package): before 2.4.41-4ubuntu3.3


CPE2.3 External links

http://ubuntu.com/security/notices/USN-4994-1

Q & A

Can this vulnerability be exploited remotely?

Is there known malware, which exploits this vulnerability?

3) NULL pointer dereference

EUVDB-ID: #VU53777

Risk: Medium

CVSSv3.1:

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 package apache2 to the latest version.

Vulnerable software versions

Ubuntu: 20.10, 21.04, 20.04, 18.04

apache2-bin (Ubuntu package): before 2.4.41-4ubuntu3.3

apache2 (Ubuntu package): before 2.4.41-4ubuntu3.3


CPE2.3 External links

http://ubuntu.com/security/notices/USN-4994-1

Q & A

Can this vulnerability be exploited remotely?

Is there known malware, which exploits this vulnerability?

4) NULL pointer dereference

EUVDB-ID: #VU53776

Risk: Low

CVSSv3.1:

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 package apache2 to the latest version.

Vulnerable software versions

Ubuntu: 20.10, 21.04, 20.04, 18.04

apache2-bin (Ubuntu package): before 2.4.41-4ubuntu3.3

apache2 (Ubuntu package): before 2.4.41-4ubuntu3.3


CPE2.3 External links

http://ubuntu.com/security/notices/USN-4994-1

Q & A

Can this vulnerability be exploited remotely?

Is there known malware, which exploits this vulnerability?

5) Input validation error

EUVDB-ID: #VU53774

Risk: Medium

CVSSv3.1:

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 package apache2 to the latest version.

Vulnerable software versions

Ubuntu: 20.10, 21.04, 20.04, 18.04

apache2-bin (Ubuntu package): before 2.4.41-4ubuntu3.3

apache2 (Ubuntu package): before 2.4.41-4ubuntu3.3


CPE2.3 External links

http://ubuntu.com/security/notices/USN-4994-1

Q & A

Can this vulnerability be exploited remotely?

Is there known malware, which exploits this vulnerability?



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