CVE-2015-3238

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2015-3238
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 of service (hang) via a large password.

6.5 /10

CVSS v3 : MEDIUM

V3 Legend

Vector : AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L

Exploitability : 3.9 / Impact : 2.5

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact LOW

Integrity Impact NONE

Availability Impact LOW

Scope UNCHANGED

5.8 /10

CVSS v2.0 : MEDIUM

V2 Legend

Vector : AV:N/AC:M/Au:N/C:P/I:N/A:P

Exploitability : 8.6 / Impact : 4.9

Access Vector NETWORK

Access Complexity MEDIUM

Authentication NONE

Confidentiality Impact PARTIAL

Integrity Impact NONE

Availability Impact PARTIAL

References
Link Resource
http://lists.fedoraproject.org/pipermail/package-announce/2015-July/161350.html
http://lists.fedoraproject.org/pipermail/package-announce/2015-June/161249.html
http://rhn.redhat.com/errata/RHSA-2015-1640.html Vendor Advisory
http://www.openwall.com/lists/oss-security/2015/06/25/13
http://www.oracle.com/technetwork/security-advisory/cpuapr2016v3-2985753.html
http://www.securityfocus.com/bid/75428
http://www.ubuntu.com/usn/USN-2935-1
http://www.ubuntu.com/usn/USN-2935-2
http://www.ubuntu.com/usn/USN-2935-3
https://bugzilla.redhat.com/show_bug.cgi?id=1228571
https://security.gentoo.org/glsa/201605-05
https://www.trustwave.com/Resources/Security-Advisories/Advisories/TWSL2015-011/?fid=6551 Exploit
https://www.trustwave.com/Resources/SpiderLabs-Blog/Username-Enumeration-against-OpenSSH-SELinux-with-CVE-2015-3238/ Exploit
Configurations

Configuration 1 (hide)

cpe:2.3:a:linux-pam:linux-pam:*:*:*:*:*:*:*:*

Configuration 2 (hide)

cpe:2.3:a:oracle:sparc-opl_service_processor:*:*:*:*:*:*:*:*
History

12 Feb 2023, 23:15

Type Values Removed Values Added
References
  • {'url': 'https://access.redhat.com/security/cve/CVE-2015-3238', 'name': 'https://access.redhat.com/security/cve/CVE-2015-3238', 'tags': [], 'refsource': 'MISC'}
  • {'url': 'https://access.redhat.com/errata/RHSA-2015:1640', 'name': 'https://access.redhat.com/errata/RHSA-2015:1640', 'tags': [], 'refsource': 'MISC'}
Summary It was discovered that the _unix_run_helper_binary() function of PAM's unix_pam module could write to a blocking pipe, possibly causing the function to become unresponsive. An attacker able to supply large passwords to the unix_pam module could use this flaw to enumerate valid user accounts, or cause a denial of service on the system. 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 of service (hang) via a large password.

02 Feb 2023, 15:16

Type Values Removed Values Added
Summary 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 of service (hang) via a large password. It was discovered that the _unix_run_helper_binary() function of PAM's unix_pam module could write to a blocking pipe, possibly causing the function to become unresponsive. An attacker able to supply large passwords to the unix_pam module could use this flaw to enumerate valid user accounts, or cause a denial of service on the system.
References
  • (MISC) https://access.redhat.com/security/cve/CVE-2015-3238 -
  • (MISC) https://access.redhat.com/errata/RHSA-2015:1640 -
Information

Published : 2015-08-24 14:59

Updated : 2023-12-10 11:46

NVD link : CVE-2015-3238

Mitre link : CVE-2015-3238

CVE.ORG link : CVE-2015-3238

JSON object : View

Products Affected

oracle

  • sparc-opl_service_processor

linux-pam

  • linux-pam
CWE
CWE-200

Exposure of Sensitive Information to an Unauthorized Actor