ArchLinux: 201903-16: dovecot: privilege escalation
Summary
A stack-based buffer overflow has been found in Dovecot versions prior to 2.3.5.1. When reading FTS or POP3-UIDL header from dovecot index, the input buffer size is not bound, and data is copied to target structure causing stack overflow. This can be used for local root privilege escalation or executing arbitrary code in dovecot process context. This requires ability to directly modify dovecot indexes.
Resolution
Upgrade to 2.3.5.1-1.
# pacman -Syu "dovecot>=2.3.5.1-1"
The problem has been fixed upstream in version 2.3.5.1.
References
https://seclists.org/oss-sec/2019/q1/197 https://dovecot.org/pipermail/dovecot/2019-March/115296.html https://github.com/dovecot/core/commit/79679674eb6d2c7d38f2537e613efc103058dff1 https://github.com/dovecot/core/commit/d79845350e0754f5e25c41bd56591ddd5b0a35fd https://security.archlinux.org/CVE-2019-7524
Workaround
None.