Описание
An out-of-bounds read flaw was found in Samba's Kerberos Key Distribution Center's (KDC) password change (kpasswd) service. When processing malformed ASN.1-encoded Kerberos password change request, Samba server miscalculates the structure size and attempts to read up to six bytes beyond the end of the allocated buffer. While this out-of-bounds read typically results in a harmless decryption failure, if the read hits unmapped memory, it causes the KDC process to crash. An authenticated attacker can send a specially crafted kpasswd request containing malformed ASN.1 data to trigger the out-of-bounds read, which may cause the KDC process to terminate, resulting in a denial of service.
Отчет
Red Hat Product Security has rated this vulnerability as having a Moderate security impact. Successful exploitation requires an authenticated attacker to craft a malformed ASN.1-encoded Kerberos password change request that precisely triggers the underlying parsing flaw, increasing the attack complexity. The Samba project also notes that the attack is unreliable in practice and an attacker may need to perform numerous kpasswd attempts before successfully causing the service to terminate.
Samba AD DC Deployments (Affected): Deployments explicitly configured to operate as a Samba Active Directory Domain Controller (server role = active directory domain controller) are affected.
Меры по смягчению последствий
Administrators who do not require the Kerberos password change service may disable it by setting kpasswd port = 0 in /etc/samba/smb.conf.
Where disabling the service is not practical, rate-limiting access to the kpasswd service may reduce the likelihood of successful exploitation until an updated package can be applied.
Note: Disabling kpasswd port will prevent domain users from changing their Kerberos passwords via the kpasswd protocol until patched.
Затронутые пакеты
| Платформа | Пакет | Состояние | Рекомендация | Релиз |
|---|---|---|---|---|
| Red Hat Enterprise Linux 10 | samba | Not affected | ||
| Red Hat Enterprise Linux 6 | samba | Not affected | ||
| Red Hat Enterprise Linux 6 | samba4 | Not affected | ||
| Red Hat Enterprise Linux 7 | samba | Not affected | ||
| Red Hat Enterprise Linux 8 | samba | Not affected | ||
| Red Hat Enterprise Linux 9 | samba | Not affected | ||
| Red Hat OpenShift Container Platform 4 | openshift/ose-rhel-coreos-8 | Not affected | ||
| Red Hat OpenShift Container Platform 4 | openshift/ose-rhel-coreos-9 | Not affected | ||
| Red Hat OpenShift Container Platform 5 | openshift/ose-rhel-coreos-9 | Not affected |
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Дополнительная информация
Статус:
EPSS
5.3 Medium
CVSS3
Связанные уязвимости
An out-of-bounds read flaw was found in Samba's Kerberos Key Distribution Center's (KDC) password change (kpasswd) service. When processing malformed ASN.1-encoded Kerberos password change request, Samba server miscalculates the structure size and attempts to read up to six bytes beyond the end of the allocated buffer. While this out-of-bounds read typically results in a harmless decryption failure, if the read hits unmapped memory, it causes the KDC process to crash. An authenticated attacker can send a specially crafted kpasswd request containing malformed ASN.1 data to trigger the out-of-bounds read, which may cause the KDC process to terminate, resulting in a denial of service.
An out-of-bounds read flaw was found in Samba's Kerberos Key Distribution Center's (KDC) password change (kpasswd) service. When processing malformed ASN.1-encoded Kerberos password change request, Samba server miscalculates the structure size and attempts to read up to six bytes beyond the end of the allocated buffer. While this out-of-bounds read typically results in a harmless decryption failure, if the read hits unmapped memory, it causes the KDC process to crash. An authenticated attacker can send a specially crafted kpasswd request containing malformed ASN.1 data to trigger the out-of-bounds read, which may cause the KDC process to terminate, resulting in a denial of service.
An out-of-bounds read flaw was found in Samba's Kerberos Key Distribut ...
EPSS
5.3 Medium
CVSS3