Uncontrolled Recursion - CVE-2020-16094
Published: July 28, 2020 / Updated: October 16, 2020
Vulnerability identifier: #VU47694
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2020-16094
CWE-ID: CWE-674
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote non-authenticated attacker to perform a denial of service (DoS) attack.
In imap_scan_tree_recursive in Claws Mail through 3.17.6, a malicious IMAP server can trigger stack consumption because of unlimited recursion into subdirectories during a rebuild of the folder tree.
Affected software
claws-mail (Alpine package)
claws-mail
Fedora
claws-mail
Fedora
How to mitigate CVE-2020-16094
Install update from vendor's website.
claws-mail - addressed in versions 3.17.7-1.fc31, 3.17.7-1.fc32, 3.17.7-1.fc33
External References
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/3CRKHUOVTJBHT53J4CYU53PXYYQKSGEA/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/JUBLHUG2UCXVABAGN5FVTD3AB3YKE5NN/
- https://www.thewildbeast.co.uk/claws-mail/bugzilla/show_bug.cgi?id=4313