NULL pointer dereference in php7 (Alpine package)



Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2021-21702
CWE-ID CWE-476
Exploitation vector Network
Public exploit N/A
Vulnerable software
 php7 (Alpine package)
Operating systems & Components / Operating system package or component

Vendor Alpine Linux Development Team

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) NULL pointer dereference

EUVDB-ID: #VU50403

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-2021-21702

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

Mitigation

Install update from vendor's website.

Vulnerable software versions

php7 (Alpine package): 7.3.7-r0 - 7.4.14-r0

CPE2.3 External links

https://git.alpinelinux.org/aports/commit/?id=f02a09d92f8e9b0b056cd083155c0cd2b22d3e18
https://git.alpinelinux.org/aports/commit/?id=22c618525dfb6ca90f02cc171c9aa97b2dcf418e
https://git.alpinelinux.org/aports/commit/?id=3fc482c6b547e3abb034df263ea4553a92283997
https://git.alpinelinux.org/aports/commit/?id=1200b256e3e18a72b01f31915e839e1fbd9ca0d8
https://git.alpinelinux.org/aports/commit/?id=212ff6b70afd9afdb6585306de50fb4b6e9d50d5


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.



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