SB2020072104 - OpenSUSE Linux update for ldb, samba

Description

This security bulletin contains information about 6 secuirty vulnerabilities.

1) Use-after-free (CVE-ID: CVE-2020-10700)

The vulnerability allows a remote attacker to perform a denial of service attack.

The vulnerability exists due to a use-after-free error when Paged results control is combined with ASQ control while performing search operations. A remote authenticated user can send a specially crafted LDAP search query, trigger a use-after-free error and perform a denial of service attack.

2) Stack-based buffer overflow (CVE-ID: CVE-2020-10704)

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a boundary error when processing LDAP queries. A remote unauthenticated attacker can send large CLDAP packets to the affected system, trigger stack overflow and crash the service.

3) NULL pointer dereference (CVE-ID: CVE-2020-10730)

The vulnerability allows a remote user to perform a denial of service (DoS) attack.

The vulnerability exists due to a NULL pointer dereference error in Samba AD DC LDAP Server with ASQ, VLV and paged_results. A remote authenticated user can pass specially crafted data to the application and perform a denial of service (DoS) attack by triggering a NULL pointer dereference or us-after-free error.

4) Resource exhaustion (CVE-ID: CVE-2020-10745)

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to application does not properly control consumption of internal resources when processing NBT and DNS replies.  A remote attacker can send a name in the reply to a NBT or DNS request and consume excessive CPU resources, resulting in denial of service conditions.

5) Use-after-free (CVE-ID: CVE-2020-10760)

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a use-after-free error  in Samba AD DC Global Catalog with paged_results and VLV. A remote user can send a specially crafted request to the LDAP server, trigger a use-after-free error and perform a denial of service attack.

6) Input validation error (CVE-ID: CVE-2020-14303)

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to insufficient validation of UDp packets with 0 length data  in Samba. A remote attacker can send a specially crafted UDP packet to port 137/TCP and perform a denial of service (DoS) attack.

Remediation

Install update from vendor's website.

References

• https://lists.opensuse.org/opensuse-security-announce/2020-07/msg00054.html