Debian update for php7.4

Published: 2022-02-21

Risk	Medium
Patch available	YES
Number of vulnerabilities	2
CVE-ID	CVE-2021-21707 CVE-2021-21708
CWE-ID	CWE-20 CWE-416
Exploitation vector	Network
Public exploit	Public exploit code for vulnerability #2 is available.
Vulnerable software	php7.4 (Debian package) Operating systems & Components / Operating system package or component
Vendor	Debian

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) Input validation error

EUVDB-ID: #VU58331

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-2021-21707

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a remote attacker to inject arbitrary XML code.

The vulnerability exists due to insufficient validation of user-supplied input within the simplexml_load_file() PHP function when processing NULL byte character (e.g. %00). A remote attacker can pass specially crafted URL to the application and bypass implemented security restrictions.

Mitigation

Update php7.4 package to version 7.4.28-1+deb11u1.

Vulnerable software versions

php7.4 (Debian package): 7.4.0~rc6-1 - 7.4.11-1

CPE2.3

External links

https://www.debian.org/security/2022/dsa-5082

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) Use-after-free

EUVDB-ID: #VU60707

Risk: Medium

CVSSv4.0: 5.5 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P/U:Green]

CVE-ID: CVE-2021-21708

CWE-ID: CWE-416 - Use After Free

Exploit availability: Yes