Use-after-free vulnerability in OpenSMTPD before 5.7.2 allows remote attackers to cause a denial of service (crash) or execute arbitrary code via vectors involving req_ca_vrfy_smtp and req_ca_vrfy_mta.
The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.
| Link | Tags |
|---|---|
| http://www.openwall.com/lists/oss-security/2015/10/03/1 | mailing list vdb entry third party advisory |
| http://lists.fedoraproject.org/pipermail/package-announce/2015-November/170448.html | third party advisory vendor advisory |
| https://www.opensmtpd.org/announces/release-5.7.2.txt | release notes vendor advisory |
| http://www.securityfocus.com/bid/76975 | vdb entry third party advisory |
| https://www.qualys.com/2015/10/02/opensmtpd-audit-report.txt | exploit third party advisory technical description |
| http://lists.fedoraproject.org/pipermail/package-announce/2015-October/169600.html | third party advisory vendor advisory |
| https://bugzilla.redhat.com/show_bug.cgi?id=1268793 | issue tracking vdb entry third party advisory |