Описание
An issue was discovered in shadow 4.5. newgidmap (in shadow-utils) is setuid and allows an unprivileged user to be placed in a user namespace where setgroups(2) is permitted. This allows an attacker to remove themselves from a supplementary group, which may allow access to certain filesystem paths if the administrator has used "group blacklisting" (e.g., chmod g-rwx) to restrict access to paths. This flaw effectively reverts a security feature in the kernel (in particular, the /proc/self/setgroups knob) to prevent this sort of privilege escalation.
| Релиз | Статус | Примечание |
|---|---|---|
| artful | ignored | end of life |
| bionic | released | 1:4.5-1ubuntu2.2 |
| cosmic | ignored | end of life |
| devel | not-affected | 1:4.8.1-1ubuntu5.20.04 |
| disco | ignored | end of life |
| eoan | ignored | end of life |
| esm-infra-legacy/trusty | released | 1:4.1.5.1-1ubuntu9.5+esm1 |
| esm-infra/bionic | released | 1:4.5-1ubuntu2.2 |
| esm-infra/focal | not-affected | 1:4.8.1-1ubuntu5.20.04 |
| esm-infra/xenial | released | 1:4.2-3.1ubuntu5.5+esm1 |
Показывать по
5 Medium
CVSS2
5.3 Medium
CVSS3
Связанные уязвимости
An issue was discovered in shadow 4.5. newgidmap (in shadow-utils) is setuid and allows an unprivileged user to be placed in a user namespace where setgroups(2) is permitted. This allows an attacker to remove themselves from a supplementary group, which may allow access to certain filesystem paths if the administrator has used "group blacklisting" (e.g., chmod g-rwx) to restrict access to paths. This flaw effectively reverts a security feature in the kernel (in particular, the /proc/self/setgroups knob) to prevent this sort of privilege escalation.
An issue was discovered in shadow 4.5. newgidmap (in shadow-utils) is setuid and allows an unprivileged user to be placed in a user namespace where setgroups(2) is permitted. This allows an attacker to remove themselves from a supplementary group, which may allow access to certain filesystem paths if the administrator has used "group blacklisting" (e.g., chmod g-rwx) to restrict access to paths. This flaw effectively reverts a security feature in the kernel (in particular, the /proc/self/setgroups knob) to prevent this sort of privilege escalation.
An issue was discovered in shadow 4.5. newgidmap (in shadow-utils) is ...
5 Medium
CVSS2
5.3 Medium
CVSS3