Reachable Assertion in krb5 (Alpine package)
| Risk | Low |
| Patch available | YES |
| Number of vulnerabilities | 1 |
| CVE-ID | CVE-2018-20217 |
| CWE-ID | CWE-617 |
| Exploitation vector | Network |
| Public exploit | N/A |
| Vulnerable software Subscribe |
krb5 (Alpine package) Operating systems & Components / Operating system package or component |
| Vendor | Alpine Linux Development Team |
Security Bulletin
This security bulletin contains one low risk vulnerability.
1) Reachable Assertion
EUVDB-ID: #VU17350
Risk: Low
CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]
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.
MitigationInstall update from vendor's website.
Vulnerable software versionskrb5 (Alpine package): 1.14.3-r2
External linkshttp://git.alpinelinux.org/aports/commit/?id=72c41026c0aed3a784192e5ab43ef9d2c7a38ced
http://git.alpinelinux.org/aports/commit/?id=7972b2ef858d1a229aac295737e382b6a30af0ca
http://git.alpinelinux.org/aports/commit/?id=bd4ce5b0529e8f12a984bdfd4d231664a613454a
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.
