Input validation error in GNU C Library (glibc) - CVE-2013-7423
Published: September 1, 2021 / Updated: June 3, 2025
Vulnerability identifier: #VU110110
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2013-7423
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote non-authenticated attacker to corrupt data.
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 software
GNU C Library (glibc)
Gentoo Linux
Red Hat Enterprise Linux Server - AUS
System x Integrated Management Module (IMM2)
Flex System Integrated Management Module (IMM2)
Integrated Management Module II (IMM2) for BladeCenter Systems
glibc (Red Hat package)
sys-libs/glibc
Gentoo Linux
Red Hat Enterprise Linux Server - AUS
System x Integrated Management Module (IMM2)
Flex System Integrated Management Module (IMM2)
Integrated Management Module II (IMM2) for BladeCenter Systems
glibc (Red Hat package)
sys-libs/glibc
How to mitigate CVE-2013-7423
Install update from vendor's website.
GNU C Library (glibc) - update to 2.20
System x Integrated Management Module (IMM2) - update to 1AOO68L
Integrated Management Module II (IMM2) for BladeCenter Systems - update to 1AOO68L
Flex System Integrated Management Module (IMM2) - update to 1AOO68L
glibc (Red Hat package) - update to 2.12-1.132.el6_5.8
sys-libs/glibc - update to 2.21-r2
System x Integrated Management Module (IMM2) - update to 1AOO68L
Integrated Management Module II (IMM2) for BladeCenter Systems - update to 1AOO68L
Flex System Integrated Management Module (IMM2) - update to 1AOO68L
glibc (Red Hat package) - update to 2.12-1.132.el6_5.8
sys-libs/glibc - update to 2.21-r2
External References
- http://www.openwall.com/lists/oss-security/2015/01/28/20
- https://github.com/golang/go/issues/6336
- http://lists.opensuse.org/opensuse-updates/2015-02/msg00089.html
- https://sourceware.org/bugzilla/show_bug.cgi?id=15946
- http://www.ubuntu.com/usn/USN-2519-1
- http://www.securityfocus.com/bid/72844
- https://security.gentoo.org/glsa/201602-02
- https://access.redhat.com/errata/RHSA-2016:1207
- http://rhn.redhat.com/errata/RHSA-2015-0863.html
- http://seclists.org/fulldisclosure/2021/Sep/0
- http://packetstormsecurity.com/files/164014/Moxa-Command-Injection-Cross-Site-Scripting-Vulnerable-Software.html