Linux Pam
Monthly
Timing side-channel in Linux-PAM's pam_userdb module through version 1.7.2 allows plaintext password recovery by any attacker capable of repeatedly submitting authentication attempts to a service backed by the vulnerable configuration. The module's use of length-prefixed strncmp() (or strncasecmp() with PAM_ICASE_ARG) on plaintext credentials leaks both password length and individual prefix bytes via measurable response-time differences, enabling iterative character-by-character reconstruction of the stored password. Proof-of-concept exploit methodology exists per CVSS 4.0 supplemental metadata (E:P); while no CISA KEV listing was found, the high confidentiality impact (VC:H) and credential-disclosure nature make this a meaningful risk for any deployment relying on pam_userdb in plaintext mode.
A vulnerability was found in PAM. Rated medium severity (CVSS 4.7). No vendor patch available.
linux-pam (aka Linux PAM) before 1.6.0 allows attackers to cause a denial of service (blocked login process) via mkfifo because the openat call (for protect_dir) lacks O_DIRECTORY. Rated medium severity (CVSS 5.5), this vulnerability is low attack complexity. Public exploit code available.
The Linux-PAM package before 1.5.2-6.1 for openSUSE Tumbleweed allows authentication bypass for SSH logins. Rated critical severity (CVSS 9.8), this vulnerability is remotely exploitable, no authentication required, low attack complexity. This Improper Authentication vulnerability could allow attackers to bypass authentication mechanisms to gain unauthorized access.
A flaw was found in Linux-Pam in versions prior to 1.5.1 in the way it handle empty passwords for non-existing users. Rated critical severity (CVSS 9.8), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.
A incorrect variable in a SUSE specific patch for pam_access rule matching in PAM 1.3.0 in openSUSE Leap 15.0 and SUSE Linux Enterprise 15 could lead to pam_access rules not being applied (fail open). Rated high severity (CVSS 8.1), this vulnerability is remotely exploitable, no authentication required. No vendor patch available.
The _unix_run_helper_binary function in the pam_unix module in Linux-PAM (aka pam) before 1.2.1, when unable to directly access passwords, allows local users to enumerate usernames or cause a denial. Rated medium severity (CVSS 6.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available and no vendor patch available.
Multiple directory traversal vulnerabilities in pam_timestamp.c in the pam_timestamp module for Linux-PAM (aka pam) 1.1.8 allow local users to create arbitrary files or possibly bypass authentication. Rated medium severity (CVSS 5.8), this vulnerability is remotely exploitable. Public exploit code available and no vendor patch available.
Timing side-channel in Linux-PAM's pam_userdb module through version 1.7.2 allows plaintext password recovery by any attacker capable of repeatedly submitting authentication attempts to a service backed by the vulnerable configuration. The module's use of length-prefixed strncmp() (or strncasecmp() with PAM_ICASE_ARG) on plaintext credentials leaks both password length and individual prefix bytes via measurable response-time differences, enabling iterative character-by-character reconstruction of the stored password. Proof-of-concept exploit methodology exists per CVSS 4.0 supplemental metadata (E:P); while no CISA KEV listing was found, the high confidentiality impact (VC:H) and credential-disclosure nature make this a meaningful risk for any deployment relying on pam_userdb in plaintext mode.
A vulnerability was found in PAM. Rated medium severity (CVSS 4.7). No vendor patch available.
linux-pam (aka Linux PAM) before 1.6.0 allows attackers to cause a denial of service (blocked login process) via mkfifo because the openat call (for protect_dir) lacks O_DIRECTORY. Rated medium severity (CVSS 5.5), this vulnerability is low attack complexity. Public exploit code available.
The Linux-PAM package before 1.5.2-6.1 for openSUSE Tumbleweed allows authentication bypass for SSH logins. Rated critical severity (CVSS 9.8), this vulnerability is remotely exploitable, no authentication required, low attack complexity. This Improper Authentication vulnerability could allow attackers to bypass authentication mechanisms to gain unauthorized access.
A flaw was found in Linux-Pam in versions prior to 1.5.1 in the way it handle empty passwords for non-existing users. Rated critical severity (CVSS 9.8), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.
A incorrect variable in a SUSE specific patch for pam_access rule matching in PAM 1.3.0 in openSUSE Leap 15.0 and SUSE Linux Enterprise 15 could lead to pam_access rules not being applied (fail open). Rated high severity (CVSS 8.1), this vulnerability is remotely exploitable, no authentication required. No vendor patch available.
The _unix_run_helper_binary function in the pam_unix module in Linux-PAM (aka pam) before 1.2.1, when unable to directly access passwords, allows local users to enumerate usernames or cause a denial. Rated medium severity (CVSS 6.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available and no vendor patch available.
Multiple directory traversal vulnerabilities in pam_timestamp.c in the pam_timestamp module for Linux-PAM (aka pam) 1.1.8 allow local users to create arbitrary files or possibly bypass authentication. Rated medium severity (CVSS 5.8), this vulnerability is remotely exploitable. Public exploit code available and no vendor patch available.