CVE-2015-8777
First published: Mon Sep 07 2015(Updated: )
The process_envvars function in elf/rtld.c in the GNU C Library (aka glibc or libc6) before 2.23 allows local users to bypass a pointer-guarding protection mechanism via a zero value of the LD_POINTER_GUARD environment variable.
Credit: secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| GNU C Library | <=2.22 |
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Reference Links
- http://hmarco.org/bugs/glibc_ptr_mangle_weakness.html
- http://lists.fedoraproject.org/pipermail/package-announce/2016-February/177404.html
- http://lists.opensuse.org/opensuse-security-announce/2016-02/msg00036.html
- http://lists.opensuse.org/opensuse-security-announce/2016-02/msg00037.html
- http://lists.opensuse.org/opensuse-security-announce/2016-02/msg00038.html
- http://lists.opensuse.org/opensuse-security-announce/2016-02/msg00039.html
- http://www.debian.org/security/2016/dsa-3480
- http://www.openwall.com/lists/oss-security/2016/01/20/1
- http://www.securityfocus.com/bid/81469
- http://www.securitytracker.com/id/1034811
- http://www.ubuntu.com/usn/USN-2985-1
- http://www.ubuntu.com/usn/USN-2985-2
- https://access.redhat.com/errata/RHSA-2017:1916
- https://security.gentoo.org/glsa/201702-11
- https://sourceware.org/bugzilla/show_bug.cgi?id=18928
- http://seclists.org/oss-sec/2015/q3/504
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1260583
- https://sourceware.org/git/gitweb.cgi?p=glibc.git;a=commit;h=a014cecd82b71b70a6a843e250e06b541ad524f7
- http://www.openwall.com/lists/oss-security/2015/09/05/8
- https://bugzilla.redhat.com/show_bug.cgi?id=1260581
Frequently Asked Questions
What is the severity of CVE-2015-8777?
CVE-2015-8777 is classified as having a moderate severity level due to its potential to allow local users to bypass security measures.
How do I fix CVE-2015-8777?
To fix CVE-2015-8777, upgrade glibc to version 2.23 or later, which addresses the vulnerability.
Who is affected by CVE-2015-8777?
CVE-2015-8777 affects local users on systems running glibc versions prior to 2.23.
What type of attack is associated with CVE-2015-8777?
CVE-2015-8777 is associated with local privilege escalation attacks that exploit a weakness in the dynamic loader.
Is there a workaround for CVE-2015-8777?
While upgrading glibc is the recommended solution, temporarily setting the LD_POINTER_GUARD environment variable to a non-zero value may mitigate the vulnerability.
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