CVE-2015-3238: Infoleak
First published: Fri Jun 05 2015(Updated: )
From the original report: "If SELinux is enabled, the _unix_run_helper_binary function in Linux-PAM 1.1.8 and earlier hangs indefinitely when verifying a password of 65536 characters, which allows attackers to conduct username enumeration and denial of service attacks. When supplying a password of 65536 characters or more, the process will block on the write(2) call at modules/pam_unix/support.c:614 because it tries to write strlen(passwd)+1 bytes to a blocking pipe and a pipe has a limited capacity of 65536 bytes on Linux." Acknowledgements: Red Hat would like to thank Sebastien Macke of Trustwave SpiderLabs for reporting this issue.
Credit: secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux-PAM Linux-PAM | <=1.1.8 | |
| Oracle SPARC OPL Service Processor | <=1121 |
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Reference Links
- https://bugzilla.redhat.com/show_bug.cgi/attachment.cgi?id=1038860&action=diff
- https://bugzilla.redhat.com/show_bug.cgi/attachment.cgi?id=1038860&action=edit
- http://www.openwall.com/lists/oss-security/2015/06/25/13
- https://rhn.redhat.com/errata/RHSA-2015-1640.html
- https://bugzilla.redhat.com/show_bug.cgi?id=1228571
- 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
- 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://security.gentoo.org/glsa/201605-05
- https://www.trustwave.com/Resources/Security-Advisories/Advisories/TWSL2015-011/?fid=6551
- https://www.trustwave.com/Resources/SpiderLabs-Blog/Username-Enumeration-against-OpenSSH-SELinux-with-CVE-2015-3238/
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- alias/CVE-2015-3238
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- agent/references
- agent/weakness
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- agent/trending
- agent/source
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- agent/softwarecombine
- collector/nvd-index
- agent/software-canonical-lookup-request
- vendor/linux-pam
- canonical/linux-pam linux-pam
- version/linux-pam linux-pam/1.1.8
- vendor/oracle
- canonical/oracle sparc opl service processor
- version/oracle sparc opl service processor/1121