Ubuntu update for krb5
| Risk | Medium |
| Patch available | YES |
| Number of vulnerabilities | 2 |
| CVE-ID | CVE-2018-20217 CVE-2022-42898 |
| CWE-ID | CWE-617 CWE-190 |
| Exploitation vector | Network |
| Public exploit | N/A |
| Vulnerable software |
Ubuntu Operating systems & Components / Operating system libkdb5-7 (Ubuntu package) Operating systems & Components / Operating system package or component libkdb5-8 (Ubuntu package) Operating systems & Components / Operating system package or component libkdb5-9 (Ubuntu package) Operating systems & Components / Operating system package or component krb5-admin-server (Ubuntu package) Operating systems & Components / Operating system package or component krb5-kdc (Ubuntu package) Operating systems & Components / Operating system package or component libgssapi-krb5-2 (Ubuntu package) Operating systems & Components / Operating system package or component libkdb5-10 (Ubuntu package) Operating systems & Components / Operating system package or component krb5-user (Ubuntu package) Operating systems & Components / Operating system package or component |
| Vendor | Canonical Ltd. |
Security Bulletin
This security bulletin contains information about 2 vulnerabilities.
1) Reachable Assertion
EUVDB-ID: #VU17350
Risk: Low
CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]
CVE-ID: CVE-2018-20217
CWE-ID:
CWE-617 - Reachable Assertion
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to a reachable assertion in in the KDC. A remote attacker can obtain a krbtgt ticket using an older encryption type (single-DES, triple-DES, or RC4) and crash the KDC by making an S4U2Self request.
MitigationUpdate the affected package krb5 to the latest version.
Vulnerable software versionsUbuntu: 14.04 - 22.10
libkdb5-7 (Ubuntu package): before Ubuntu Pro (Infra-only)
libkdb5-8 (Ubuntu package): before Ubuntu Pro (Infra-only)
libkdb5-9 (Ubuntu package): before 1.16-2ubuntu0.3
krb5-admin-server (Ubuntu package): before Ubuntu Pro (Infra-only)
krb5-kdc (Ubuntu package): before Ubuntu Pro (Infra-only)
libgssapi-krb5-2 (Ubuntu package): before Ubuntu Pro (Infra-only)
libkdb5-10 (Ubuntu package): before 1.19.2-2ubuntu0.1
krb5-user (Ubuntu package): before Ubuntu Pro (Infra-only)
CPE2.3- cpe:2.3:o:canonical:ubuntu:14.04:*:*:*:*:*:*:*
- cpe:2.3:o:canonical:ubuntu:16.04:*:*:*:*:*:*:*
- cpe:2.3:o:canonical:ubuntu:18.04:*:*:*:*:*:*:*
- cpe:2.3:o:canonical:ubuntu:20.04:*:*:*:*:*:*:*
- cpe:2.3:o:canonical:ubuntu:22.04:*:*:*:*:*:*:*
- cpe:2.3:o:canonical:ubuntu:22.10:*:*:*:*:*:*:*
- cpe:2.3:a:canonical:libkdb5-7:*:*:*:*:*:ubuntu:*:*
- cpe:2.3:a:canonical:libkdb5-8_ubuntu_package:*:*:*:*:*:ubuntu:*:*
- cpe:2.3:a:canonical:libkdb5-9_ubuntu_package:*:*:*:*:*:ubuntu:*:*
- cpe:2.3:a:canonical:krb5-admin-server_ubuntu_package:*:*:*:*:*:ubuntu:*:*
- cpe:2.3:a:canonical:krb5-kdc_ubuntu_package:*:*:*:*:*:ubuntu:*:*
- cpe:2.3:a:canonical:libgssapi-krb5-2_ubuntu_package:*:*:*:*:*:ubuntu:*:*
- cpe:2.3:a:canonical:libkdb5-10_ubuntu_package:*:*:*:*:*:ubuntu:*:*
- cpe:2.3:a:canonical:krb5-user_ubuntu_package:*:*:*:*:*:ubuntu:*:*
https://ubuntu.com/security/notices/USN-5828-1
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
2) Integer overflow
EUVDB-ID: #VU69337
Risk: Medium
CVSSv4.0: 5.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]
CVE-ID: CVE-2022-42898
CWE-ID:
CWE-190 - Integer overflow
Exploit availability: No
DescriptionThe vulnerability allows a remote user to execute arbitrary code on the target system.
The vulnerability exists due to an integer overflow within the S4U2Proxy handler on 32-bit systems. A remote user can send specially crafted request to the KDC server, trigger an integer overflow and execute arbitrary code on the target system.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
MitigationUpdate the affected package krb5 to the latest version.
Vulnerable software versionsUbuntu: 14.04 - 22.10
libkdb5-7 (Ubuntu package): before Ubuntu Pro (Infra-only)
libkdb5-8 (Ubuntu package): before Ubuntu Pro (Infra-only)
libkdb5-9 (Ubuntu package): before 1.16-2ubuntu0.3
krb5-admin-server (Ubuntu package): before Ubuntu Pro (Infra-only)
krb5-kdc (Ubuntu package): before Ubuntu Pro (Infra-only)
libgssapi-krb5-2 (Ubuntu package): before Ubuntu Pro (Infra-only)
libkdb5-10 (Ubuntu package): before 1.19.2-2ubuntu0.1
krb5-user (Ubuntu package): before Ubuntu Pro (Infra-only)
CPE2.3- cpe:2.3:o:canonical:ubuntu:14.04:*:*:*:*:*:*:*
- cpe:2.3:o:canonical:ubuntu:16.04:*:*:*:*:*:*:*
- cpe:2.3:o:canonical:ubuntu:18.04:*:*:*:*:*:*:*
- cpe:2.3:o:canonical:ubuntu:20.04:*:*:*:*:*:*:*
- cpe:2.3:o:canonical:ubuntu:22.04:*:*:*:*:*:*:*
- cpe:2.3:o:canonical:ubuntu:22.10:*:*:*:*:*:*:*
- cpe:2.3:a:canonical:libkdb5-7:*:*:*:*:*:ubuntu:*:*
- cpe:2.3:a:canonical:libkdb5-8_ubuntu_package:*:*:*:*:*:ubuntu:*:*
- cpe:2.3:a:canonical:libkdb5-9_ubuntu_package:*:*:*:*:*:ubuntu:*:*
- cpe:2.3:a:canonical:krb5-admin-server_ubuntu_package:*:*:*:*:*:ubuntu:*:*
- cpe:2.3:a:canonical:krb5-kdc_ubuntu_package:*:*:*:*:*:ubuntu:*:*
- cpe:2.3:a:canonical:libgssapi-krb5-2_ubuntu_package:*:*:*:*:*:ubuntu:*:*
- cpe:2.3:a:canonical:libkdb5-10_ubuntu_package:*:*:*:*:*:ubuntu:*:*
- cpe:2.3:a:canonical:krb5-user_ubuntu_package:*:*:*:*:*:ubuntu:*:*
https://ubuntu.com/security/notices/USN-5828-1
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
