What’s Vulnerable › Vulnerabilities

CVE-2013-7423

• Severity: medium (CVSS 5.0 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 5.8% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2015-02-24 · updated 2026-06-17
• Weakness: CWE-17

Description

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.

Affected products

• Canonical Ubuntu Linux: 10.04, 12.04, 14.04, 14.10
• GNU C Library (glibc): before 2.20 — fixed in 2.20
• Opensuse: 13.1, 13.2
• RedHat Enterprise Linux Server Aus: 6.5

How to fix

Upgrade to a fixed version: GNU C Library (glibc) 2.20. Check the vendor advisory for mitigations.

References

• 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
• http://lists.opensuse.org/opensuse-updates/2015-02/msg00089.html

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