Description
Memory leak in the Privilege Attribute Certificate (PAC) responder plugin (sssd_pac_plugin.so) in System Security Services Daemon (SSSD) 1.10 before 1.13.1 allows remote authenticated users to cause a denial of service (memory consumption) via a large number of logins that trigger parsing of PAC blobs during Kerberos authentication.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | sssd | 1.13.1-1 | — |
| Debian 13 | sssd | 1.13.1-1 | — |
| Debian 12 | sssd | 1.13.1-1 | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 7 | sssd +26 | 1.13.0-40.el7 | RHSA-2015:2355 |
| RHEL 6 | sssd +22 | 1.12.4-47.el6_7.4 | RHSA-2015:2019 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 7 | sssd +26 | 1.13.0-40.el7 | ELSA-2015-2355 |
Advisories 3
- RHSA-2015:2355 Red Hat Security Advisory: sssd security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Jun 27, 2026
- RHSA-2015:2019 Red Hat Security Advisory: sssd security and bug fix update Red Hat Security Advisories (RHSA) · Jun 27, 2026
- ELSA-2015-2355 Low: sssd security, bug fix, and enhancement update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Nov 24, 2015
References
- RHSA-2015:2355 vendor-advisory
- RHSA-2015:2019 vendor-advisory
- [sssd-users] 20151021 A security bug in SSSD 1.10 and later (CVE-2015-5292) mailing-list
- 1034038 vdb-entry
- 77529 vdb-entry
- http://www.oracle.com/technetwork/topics/security/linuxbulletinoct2015-2719645.html
- https://fedorahosted.org/sssd/attachment/ticket/2803/0001-Fix-memory-leak-in-sssdpac_verify.patch
- FEDORA-2015-cdea5324a8 vendor-advisory
- FEDORA-2015-202c127199 vendor-advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1267580
- FEDORA-2015-7b47df69d3 vendor-advisory
- https://fedorahosted.org/sssd/ticket/2803
- https://fedorahosted.org/sssd/wiki/Releases/Notes-1.13.1