CVE-2021-29157 Information

Description

Dovecot before 2.3.15 allows ../ Path Traversal. An attacker with access to the local filesystem can trick OAuth2 authentication into using an HS256 validation key from an attacker-controlled location. This occurs during use of local JWT validation with the posix fs driver.

CVSS Vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Reference

https://dovecot.org/security https://www.openwall.com/lists/oss-security/2021/06/28/1 https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/TK424DWFO2TKJYXZ2H3XL633TYJL4GQN/ https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/JB2VTJ3G2ILYWH5Y2FTY2PUHT2MD6VMI/ https://security.gentoo.org/glsa/202107-41

Attack Complexity

LOW

Privileges Required

LOW

User Interaction Required

LOW

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

NONE

Base Score

NONE

Base Severity

5.5