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CVE-2015-3238

pam: DoS/user enumeration due to blocking pipe in pam_unix module

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Severity

Moderate

Red Hat Product Security

6.4

CVSS 2.0

Review impact separately from score.

Published · June 25, 2015

Updated · June 27, 2026

Description

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.

CVSS score applicability

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation

No mitigation is specified in collected source.

CVSS / CWE

CVSS 2.0 · 6.4
AV:N/AC:L/Au:N/C:P/I:N/A:P

CWE-770 · Allocation of Resources Without Limits or Throttling