CVE-2021-25216

Katalog CVE

CVSS 9.8 · Critical EPSS 82,4%

Kerentanan Out-of-bounds Read pada debian linux, isc bind +12 lainnya. Skor CVSS 3.1 9.8 (Critical) menurut NVD.

Deskripsi (NVD)

In BIND 9.5.0 -> 9.11.29, 9.12.0 -> 9.16.13, and versions BIND 9.11.3-S1 -> 9.11.29-S1 and 9.16.8-S1 -> 9.16.13-S1 of BIND Supported Preview Edition, as well as release versions 9.17.0 -> 9.17.1 of the BIND 9.17 development branch, BIND servers are vulnerable if they are running an affected version and are configured to use GSS-TSIG features. In a configuration which uses BIND's default settings the vulnerable code path is not exposed, but a server can be rendered vulnerable by explicitly setting values for the tkey-gssapi-keytab or tkey-gssapi-credential configuration options. Although the default configuration is not vulnerable, GSS-TSIG is frequently used in networks where BIND is integrated with Samba, as well as in mixed-server environments that combine BIND servers with Active Directory domain controllers. For servers that meet these conditions, the ISC SPNEGO implementation is vulnerable to various attacks, depending on the CPU architecture for which BIND was built: For named binaries compiled for 64-bit platforms, this flaw can be used to trigger a buffer over-read, leading to a server crash. For named binaries compiled for 32-bit platforms, this flaw can be used to trigger a server crash due to a buffer overflow and possibly also to achieve remote code execution. We have determined that standard SPNEGO implementations are available in the MIT and Heimdal Kerberos libraries, which support a broad range of operating systems, rendering the ISC implementation unnecessary and obsolete. Therefore, to reduce the attack surface for BIND users, we will be removing the ISC SPNEGO implementation in the April releases of BIND 9.11 and 9.16 (it had already been dropped from BIND 9.17). We would not normally remove something from a stable ESV (Extended Support Version) of BIND, but since system libraries can replace the ISC SPNEGO implementation, we have made an exception in this case for reasons of stability and security.

Rincian

Terbit di NVD

29 April 2021

Terakhir diubah

17 Juni 2026

Status NVD

Modified

CVSS 3.1

9.8 (Critical), sumber NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H · uraikan di kalkulator

Jenis kelemahan (CWE)

CWE-125: Out-of-bounds Read

EPSS (30 hari)

82,4% peluang dieksploitasi; lebih tinggi dari 99,6% CVE lain

Produk dan versi terdampak

> Data dari konfigurasi CPE di NVD.

Referensi dan perbaikan

• https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf patch · advisory pihak ketiga
• http://www.openwall.com/lists/oss-security/2021/04/29/1 mailing list · advisory pihak ketiga
• http://www.openwall.com/lists/oss-security/2021/04/29/2 mailing list · advisory pihak ketiga
• http://www.openwall.com/lists/oss-security/2021/04/29/3 mailing list · advisory pihak ketiga
• http://www.openwall.com/lists/oss-security/2021/04/29/4 mailing list · advisory pihak ketiga
• https://lists.debian.org/debian-lts-announce/2021/05/msg00001.html mailing list · advisory pihak ketiga
• https://security.netapp.com/advisory/ntap-20210521-0006/ advisory pihak ketiga
• https://www.debian.org/security/2021/dsa-4909 advisory pihak ketiga
• https://www.zerodayinitiative.com/advisories/ZDI-21-657/ advisory pihak ketiga · vdb entry
• https://kb.isc.org/v1/docs/cve-2021-25215 not applicable