PHP up to 7.3.31/7.4.25/8.0.12 FPM SAPI out-of-bounds write

Summaryinfo

A vulnerability was found in PHP up to 7.3.31/7.4.25/8.0.12. It has been rated as critical. This affects an unknown function of the component FPM SAPI. Performing a manipulation results in out-of-bounds write. This vulnerability is known as CVE-2021-21703. Remote exploitation of the attack is possible. No exploit is available. Applying a patch is the recommended action to fix this issue.

Detailsinfo

A vulnerability was found in PHP up to 7.3.31/7.4.25/8.0.12 (Programming Language Software). It has been classified as critical. This affects an unknown function of the component FPM SAPI. The manipulation with an unknown input leads to a out-of-bounds write vulnerability. CWE is classifying the issue as CWE-787. The product writes data past the end, or before the beginning, of the intended buffer. This is going to have an impact on confidentiality, integrity, and availability.

The weakness was published 10/25/2021 as 81026. The advisory is shared at bugs.php.net. This vulnerability is uniquely identified as CVE-2021-21703 since 01/04/2021. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 03/29/2022).

Applying the patch cb2021e5f69da5e2868130a05bb53db0f9f89e4b is able to eliminate this problem. The bugfix is ready for download at github.com.

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Type

• Programming Language Software

Name

• PHP

Version

• 7.3.0
• 7.3.1
• 7.3.2
• 7.3.3
• 7.3.4
• 7.3.5
• 7.3.6
• 7.3.7
• 7.3.8
• 7.3.9
• 7.3.10
• 7.3.11
• 7.3.12
• 7.3.13
• 7.3.14
• 7.3.15
• 7.3.16
• 7.3.17
• 7.3.18
• 7.3.19
• 7.3.20
• 7.3.21
• 7.3.22
• 7.3.23
• 7.3.24
• 7.3.25
• 7.3.26
• 7.3.27
• 7.3.28
• 7.3.29
• 7.3.30
• 7.3.31
• 7.4.0
• 7.4.1
• 7.4.2
• 7.4.3
• 7.4.4
• 7.4.5
• 7.4.6
• 7.4.7
• 7.4.8
• 7.4.9
• 7.4.10
• 7.4.11
• 7.4.12
• 7.4.13
• 7.4.14
• 7.4.15
• 7.4.16
• 7.4.17
• 7.4.18
• 7.4.19
• 7.4.20
• 7.4.21
• 7.4.22
• 7.4.23
• 7.4.24
• 7.4.25
• 8.0.0
• 8.0.1
• 8.0.2
• 8.0.3
• 8.0.4
• 8.0.5
• 8.0.6
• 8.0.7
• 8.0.8
• 8.0.9
• 8.0.10
• 8.0.11
• 8.0.12

License

• open-source

Website

• Product: https://www.php.org/

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