fail2ban is a daemon to ban hosts that cause multiple authentication errors. In versions 0.9.7 and prior, 0.10.0 through 0.10.6, and 0.11.0 through 0.11.2, there is a vulnerability that leads to possible remote code execution in the mailing action mail-whois. Command `mail` from mailutils package used in mail actions like `mail-whois` can execute command if unescaped sequences (`\n~`) are available in "foreign" input (for instance in whois output). To exploit the vulnerability, an attacker would need to insert malicious characters into the response sent by the whois server, either via a MITM attack or by taking over a whois server. The issue is patched in versions 0.10.7 and 0.11.3. As a workaround, one may avoid the usage of action `mail-whois` or patch the vulnerability manually.
References
| Link | Resource |
|---|---|
| https://github.com/fail2ban/fail2ban/commit/410a6ce5c80dd981c22752da034f2529b5eee844 | Patch Third Party Advisory |
| https://github.com/fail2ban/fail2ban/commit/2ed414ed09b3bb4c478abc9366a1ff22024a33c9 | Patch Third Party Advisory |
| https://github.com/fail2ban/fail2ban/security/advisories/GHSA-m985-3f3v-cwmm | Exploit Patch Third Party Advisory |
| https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/5WHJK2X2MR2WDYZMCW7COZXJDUSDYMY6/ | Mailing List Third Party Advisory |
| https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ZRYQ77MTX5WSV33VCJLK4KBKR55QZ7ZA/ | Mailing List Third Party Advisory |
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Information
Published : 2021-07-16 11:15
Updated : 2021-11-28 15:18
NVD link : CVE-2021-32749
Mitre link : CVE-2021-32749
JSON object : View
CWE
CWE-78
Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
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Products Affected
fail2ban
- fail2ban
fedoraproject
- fedora