In Dovecot before 2.3.10.1, a crafted SMTP/LMTP message triggers an unauthenticated use-after-free bug in submission-login, submission, or lmtp, and can lead to a crash under circumstances involving many newlines after a command.
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 Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.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 |
|---|---|
| https://dovecot.org/security | vendor advisory |
| https://www.openwall.com/lists/oss-security/2020/05/18/1 | third party advisory mailing list |
| http://www.openwall.com/lists/oss-security/2020/05/18/1 | third party advisory mailing list |
| https://usn.ubuntu.com/4361-1/ | vendor advisory |
| http://seclists.org/fulldisclosure/2020/May/37 | mailing list third party advisory exploit |
| http://packetstormsecurity.com/files/157771/Open-Xchange-Dovecot-2.3.10-Null-Pointer-Dereference-Denial-Of-Service.html | |
| https://www.debian.org/security/2020/dsa-4690 | vendor advisory |
| https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VVUWHUUAFPC6XGIXYFIPTNBXLHPNM4W6/ | vendor advisory |
| http://lists.opensuse.org/opensuse-security-announce/2020-05/msg00059.html | vendor advisory |
| https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TTZN2VW55ZC2AQBGBJMLRJSZIKSB2NS6/ | vendor advisory |