Description
libESMTP, probably 1.0.4 and earlier, does not properly handle a '\0' character in a domain name in the subject's Common Name (CN) field of an X.509 certificate, which allows man-in-the-middle attackers to spoof arbitrary SSL servers via a crafted certificate issued by a legitimate Certification Authority, a related issue to CVE-2009-2408.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | libesmtp | 1.0.4-5 | — |
| Debian 13 | libesmtp | 1.0.4-5 | — |
| Debian 12 | libesmtp | 1.0.4-5 | — |
References
- [oss-security] 20100309 Re: CVE Request: libesmtp does not check NULL bytes in commonName mailing-list
- ADV-2010-1107 vdb-entry
- SUSE-SR:2010:011 vendor-advisory
- [oss-security] 20100303 CVE Request: libesmtp does not check NULL bytes in commonName mailing-list