CVE-2013-7423
First published: Thu Jan 29 2015(Updated: )
The send_dg function in resolv/res_send.c in GNU C Library (aka glibc or libc6) before 2.20 does not properly reuse file descriptors, which allows remote attackers to send DNS queries to unintended locations via a large number of requests that trigger a call to the getaddrinfo function.
Credit: cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Red Hat Enterprise Linux Server | =6.5 | |
| Ubuntu | =10.04 | |
| Ubuntu | =12.04 | |
| Ubuntu | =14.04 | |
| Ubuntu | =14.10 | |
| SUSE Linux | =13.1 | |
| SUSE Linux | =13.2 | |
| GNU C Library (glibc) | <2.20 |
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Reference Links
- http://lists.opensuse.org/opensuse-updates/2015-02/msg00089.html
- http://packetstormsecurity.com/files/164014/Moxa-Command-Injection-Cross-Site-Scripting-Vulnerable-Software.html
- http://rhn.redhat.com/errata/RHSA-2015-0863.html
- http://seclists.org/fulldisclosure/2021/Sep/0
- http://www.openwall.com/lists/oss-security/2015/01/28/20
- http://www.securityfocus.com/bid/72844
- http://www.ubuntu.com/usn/USN-2519-1
- https://access.redhat.com/errata/RHSA-2016:1207
- https://github.com/golang/go/issues/6336
- https://security.gentoo.org/glsa/201602-02
- https://sourceware.org/bugzilla/show_bug.cgi?id=15946
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1144019
- https://rhn.redhat.com/errata/RHSA-2015-0863.html
- https://rhn.redhat.com/errata/RHSA-2015-2199.html
- https://rhn.redhat.com/errata/RHSA-2015-2589.html
- https://bugzilla.redhat.com/show_bug.cgi?id=1187109
Frequently Asked Questions
What is the severity of CVE-2013-7423?
CVE-2013-7423 has a medium severity rating due to its potential to allow remote attackers to send DNS queries to unintended locations.
How do I fix CVE-2013-7423?
To mitigate CVE-2013-7423, update the GNU C Library to version 2.20 or later as recommended by your operating system vendor.
Which software versions are affected by CVE-2013-7423?
CVE-2013-7423 affects various versions of the GNU C Library and several Linux distributions including Red Hat Enterprise Linux 6.5 and multiple versions of Ubuntu and openSUSE.
What type of attack does CVE-2013-7423 enable?
CVE-2013-7423 enables remote attackers to exploit file descriptor reuse issues in DNS queries, leading to potential information leakage.
Is CVE-2013-7423 still a threat today?
While CVE-2013-7423 has been addressed in later versions of software, systems running affected versions remain vulnerable if not updated.
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