发布时间: 2023年4月28日
修改时间: 2024年10月31日
In Shadow 4.13, it is possible to inject control characters into fields provided to the SUID program chfn (change finger). Although it is not possible to exploit this directly (e.g., adding a new user fails because n is in the block list), it is possible to misrepresent the /etc/passwd file when viewed. Use of r manipulations and Unicode characters to work around blocking of the : character make it possible to give the impression that a new user has been added. In other words, an adversary may be able to convince a system administrator to take the system offline (an indirect, social-engineered denial of service) by demonstrating that cat /etc/passwd shows a rogue user account.
| NVD | openEuler | |
|---|---|---|
| Confidentiality | None | None |
| Attack Vector | Local | Local |
| CVSS评分 | 3.3 | 3.3 |
| Attack Complexity | Low | Low |
| Privileges Required | Low | Low |
| Scope | Unchanged | Unchanged |
| Integrity | Low | Low |
| User Interaction | None | None |
| Availability | None | None |
| 公告名 | 概要 | 发布时间 |
|---|---|---|
| KylinSec-SA-2023-1508 | shadow security update | 2023年4月28日 |
| 产品 | 包 | 状态 |
|---|---|---|
| KY3.4-4A | shadow | Fixed |
| KY3.4-5 | shadow | Fixed |
| KY3.5.1 | shadow | Fixed |
| KY3.5.2 | shadow | Fixed |
