Podatność CVE-2021-21703


Publikacja: 2021-10-25

Opis:
In PHP versions 7.3.x up to and including 7.3.31, 7.4.x below 7.4.25 and 8.0.x below 8.0.12, when running PHP FPM SAPI with main FPM daemon process running as root and child worker processes running as lower-privileged users, it is possible for the child processes to access memory shared with the main process and write to it, modifying it in a way that would cause the root process to conduct invalid memory reads and writes, which can be used to escalate privileges from local unprivileged user to the root user.

Typ:

CWE-787

CVSS2 => (AV:L/AC:L/Au:N/C:C/I:C/A:C)

Ogólna skala CVSS
Znaczenie
Łatwość wykorzystania
7.2/10
10/10
3.9/10
Wymagany dostęp
Złożoność ataku
Autoryzacja
Lokalny
Niska
Nie wymagana
Wpływ na poufność
Wpływ na integralność
Wpływ na dostępność
Pełny
Pełny
Pełny
Affected software
PHP -> PHP 
Debian -> Debian linux 

 Referencje:
https://bugs.php.net/bug.php?id=81026
https://www.debian.org/security/2021/dsa-4993
https://www.debian.org/security/2021/dsa-4992
http://www.openwall.com/lists/oss-security/2021/10/26/7
https://lists.debian.org/debian-lts-announce/2021/10/msg00021.html
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/PBM3KKB3RY2YPOKNMC4HIH7IH3T3WC74/
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/JO5RA6YOBGGGKLIA6F6BQRZDDECF5L3R/

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