| Summary | An issue was discovered in disable_priv_mode in shell.c in GNU Bash through 5.0 patch 11. By default, if Bash is run with its effective UID not equal to its real UID, it will drop privileges by setting its effective UID to its real UID. However, it does so incorrectly. On Linux and other systems that support "saved UID" functionality, the saved UID is not dropped. An attacker with command execution in the shell can use "enable -f" for runtime loading of a new builtin, which can be a shared object that calls setuid() and therefore regains privileges. However, binaries running with an effective UID of 0 are unaffected. |
|---|---|
| Publication Date | Nov. 28, 2019, 10:15 a.m. |
| Registration Date | Jan. 26, 2021, 11:40 a.m. |
| Last Update | Nov. 21, 2024, 1:32 p.m. |
| CVSS3.1 : HIGH | |
| スコア | 7.8 |
|---|---|
| Vector | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| 攻撃元区分(AV) | ローカル |
| 攻撃条件の複雑さ(AC) | 低 |
| 攻撃に必要な特権レベル(PR) | 低 |
| 利用者の関与(UI) | 不要 |
| 影響の想定範囲(S) | 変更なし |
| 機密性への影響(C) | 高 |
| 完全性への影響(I) | 高 |
| 可用性への影響(A) | 高 |
| CVSS2.0 : HIGH | |
| Score | 7.2 |
|---|---|
| Vector | AV:L/AC:L/Au:N/C:C/I:C/A:C |
| 攻撃元区分(AV) | ローカル |
| 攻撃条件の複雑さ(AC) | 低 |
| 攻撃前の認証要否(Au) | 不要 |
| 機密性への影響(C) | 高 |
| 完全性への影響(I) | 高 |
| 可用性への影響(A) | 高 |
| Get all privileges. | いいえ |
| Get user privileges | いいえ |
| Get other privileges | いいえ |
| User operation required | いいえ |
| Configuration1 | or higher | or less | more than | less than | |
| cpe:2.3:a:gnu:bash:*:*:*:*:*:*:*:* | 5.0 | ||||
| cpe:2.3:a:gnu:bash:5.0:patch1:*:*:*:*:*:* | |||||
| cpe:2.3:a:gnu:bash:5.0:patch2:*:*:*:*:*:* | |||||
| cpe:2.3:a:gnu:bash:5.0:patch3:*:*:*:*:*:* | |||||
| cpe:2.3:a:gnu:bash:5.0:patch4:*:*:*:*:*:* | |||||
| cpe:2.3:a:gnu:bash:5.0:patch5:*:*:*:*:*:* | |||||
| cpe:2.3:a:gnu:bash:5.0:patch6:*:*:*:*:*:* | |||||
| cpe:2.3:a:gnu:bash:5.0:patch7:*:*:*:*:*:* | |||||
| cpe:2.3:a:gnu:bash:5.0:patch8:*:*:*:*:*:* | |||||
| cpe:2.3:a:gnu:bash:5.0:patch9:*:*:*:*:*:* | |||||
| cpe:2.3:a:gnu:bash:5.0:patch10:*:*:*:*:*:* | |||||
| cpe:2.3:a:gnu:bash:5.0:patch11:*:*:*:*:*:* | |||||
| cpe:2.3:a:gnu:bash:5.0:beta1:*:*:*:*:*:* | |||||
| cpe:2.3:a:gnu:bash:5.0:beta2:*:*:*:*:*:* | |||||
| cpe:2.3:a:gnu:bash:5.0:rc1:*:*:*:*:*:* | |||||
| Configuration2 | or higher | or less | more than | less than | |
| cpe:2.3:a:netapp:solidfire:-:*:*:*:*:*:*:* | |||||
| cpe:2.3:a:netapp:hci_management_node:-:*:*:*:*:*:*:* | |||||
| cpe:2.3:a:netapp:oncommand_unified_manager:*:*:*:*:*:vmware_vsphere:*:* | 9.5 | ||||
| Configuration3 | or higher | or less | more than | less than | |
| cpe:2.3:a:oracle:communications_cloud_native_core_policy:1.14.0:*:*:*:*:*:*:* | |||||
| Title | GNU Bash における削除された特権に対する不適切なチェックに関する脆弱性 |
|---|---|
| Summary | GNU Bash には、削除された特権に対する不適切なチェックに関する脆弱性が存在します。 |
| Possible impacts | 情報を取得される、情報を改ざんされる、およびサービス運用妨害 (DoS) 状態にされる可能性があります。 |
| Solution | ベンダより正式な対策が公開されています。ベンダ情報を参照して適切な対策を実施してください。 |
| Publication Date | July 1, 2019, midnight |
| Registration Date | Dec. 23, 2019, 6:12 p.m. |
| Last Update | Dec. 23, 2019, 6:12 p.m. |
| GNU Project |
| bash 5.0 patch 11 まで |
| No | Changed Details | Date of change |
|---|---|---|
| 1 | [2019年12月23日] 掲載 |
Dec. 23, 2019, 6:12 p.m. |