Pedro Lineu Orso chetcpasswd before 2.4 relies on the X-Forwarded-For HTTP header when verifying a client's status on an IP address ACL, which allows remote attackers to gain unauthorized access by spoofing this header.

Pedro Lineu Orso chetcpasswd 2.3.3 does not have a rate limit for client requests, which might allow remote attackers to determine passwords via a dictionary attack.

Pedro Lineu Orso chetcpasswd before 2.3.1 does not document the need for 0400 permissions on /etc/chetcpasswd.allow, which might allow local users to gain sensitive information by reading this file.

Pedro Lineu Orso chetcpasswd 2.3.3 provides a different error message when a request with a valid username fails, compared to a request with an invalid username, which allows remote attackers to determine valid usernames on the system.

Multiple unspecified vulnerabilities in chetcpasswd 2.4.1 allow local users to gain privileges via unspecified vectors related to executing (1) the cp program, (2) the mail program, or (3) the program specified in the post_change configuration line.

Buffer overflow in Pedro Lineu Orso chetcpasswd before 1.12, when configured for access from 0.0.0.0, allows local users to gain privileges via unspecified vectors.

Untrusted search path vulnerability in Pedro Lineu Orso chetcpasswd 2.4.1 and earlier allows local users to gain privileges via a modified PATH that references a malicious cp binary. NOTE: this issue might overlap CVE-2006-6639.

chetcpasswd.cgi in Pedro Lineu Orso chetcpasswd before 2.1 allows remote attackers to read the last line of the shadow file via a long user (userid) field.