libpam-pgsql (aka pam_pgsql) 0.7 does not properly handle a NULL value returned by the password search query, which allows remote attackers to bypass authentication via a crafted password.

lucas_clemente_vella

pam_sm_authenticate in pam_pgsql.c in libpam-pgsql 0.6.3 does not properly consider operator precedence when evaluating the success of a pam_get_pass function call, which allows local users to gain privileges via a SIGINT signal when this function is executing, as demonstrated by a CTRL-C sequence at a sudo password prompt in an "auth sufficient pam_pgsql.so" configuration.

libpam-pgsql

SQL injection vulnerability in the libpam-pgsql library before 0.5.2 allows attackers to execute arbitrary SQL statements.

pam-pgsql

Format string vulnerability in pam-pgsql 0.5.2 and earlier allows remote attackers to execute arbitrary code via the username that isp rovided during authentication, which is not properly handled when recording a log message.