Resource exhaustion in Cyrus IMAP Server - CVE-2024-34055

Vulnerability identifier: #VU91167

CSH Severity: Medium

CVSS v4: 7.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2024-34055

CWE-ID: CWE-400

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote user to perform a denial of service (DoS) attack.

The vulnerability exists due to application does not properly control consumption of internal resources when handling multiple LITERALs in a single command. A remote user can trigger memory exhaustion and perform a denial of service (DoS) attack.

Cyrus IMAP Server
Debian Linux
Red Hat Enterprise Linux for x86_64
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for ARM 64
Fedora
cyrus-imapd (Red Hat package)
cyrus-imapd (Debian package)
cyrus-imapd

Install updates from vendor's website.

Cyrus IMAP Server - addressed in versions 3.4.8, 3.6.5, 3.8.3
cyrus-imapd (Red Hat package) - update to 3.4.8-1.el9
cyrus-imapd (Debian package) - update to 3.6.1-4+deb12u2
cyrus-imapd - addressed in versions 3.8.3-1.fc39, 3.8.3-1.fc40, 3.8.3-1.fc41

• https://github.com/cyrusimap/cyrus-imapd/commit/ef9e4e8314d6a06f2269af0ccf606894cc3fe489
• https://www.cyrusimap.org/imap/download/release-notes/3.8/x/3.8.3.html
• https://www.cyrusimap.org/dev/imap/download/release-notes/3.10/x/3.10.0-rc1.html

• Denial of service in Cyrus IMAP
• Fedora 41 update for cyrus-imapd
• Fedora 40 update for cyrus-imapd
• Fedora 39 update for cyrus-imapd
• Debian update for cyrus-imapd
• Red Hat Enterprise Linux 9 update for cyrus-imapd