DNS: Squid DNS Replies Invalid Free
This signature detects attempts to exploit a known vulnerability against Squid while processing certain DNS replies. A successful attack can lead to arbitrary code execution.
Extended Description
The idnsGrokReply function in Squid before 3.1.16 does not properly free memory, which allows remote attackers to cause a denial of service (daemon abort) via a DNS reply containing a CNAME record that references another CNAME record that contains an empty A record.
Affected Products
Squid-cache squid
Short Name
DNS:SQUID-DNS-REPLIES2
Severity
Minor
Recommended
False
Recommended Action
Drop
Category
DNS
Keywords
CVE-2011-4096 DNS Free Invalid Replies Squid bid:50449
Release Date
03/23/2017
Supported Platforms
mx-19.3
vmx-19.3
vsrx-19.2
srx-19.3
srx-branch-19.3
vsrx3bsd-19.2
srx-19.4
vsrx3bsd-19.4
srx-branch-19.4
vsrx-19.4
vmx-19.4
mx-19.4
srxevo-25.4
vsrx-26.2
srx-26.2
srx-branch-26.2
vsrx3bsd-26.2
mx-12.3
srx-12.3
srx-branch-12.3
vsrx-12.3
Sigpack Version
3761
False Positive
Unknown
Vendors
Squid-cache
CVSS Score
5.0