Advisory Details

April 19th, 2018

The Squid Software Foundation Squid Reverse Proxy sslBumpAccessCheck Null Pointer Dereference Denial of Service Vulnerability

ZDI-18-309
ZDI-CAN-6088

CVE ID CVE-2018-1172
CVSS SCORE 7.8, AV:N/AC:L/Au:N/C:N/I:N/A:C
AFFECTED VENDORS The Squid Software Foundation
AFFECTED PRODUCTS Squid
VULNERABILITY DETAILS


This vulnerability allows remote attackers to deny service on vulnerable installations of The Squid Software Foundation Squid. Authentication is not required to exploit this vulnerability.

The specific flaw exists within ClientRequestContext::sslBumpAccessCheck(). A crafted request can trigger the dereference of a null pointer. An attacker can leverage this vulnerability to create a denial-of-service condition to users of the system.
ADDITIONAL DETAILS The Squid Software Foundation has issued an update to correct this vulnerability. More details can be found at:
http://www.squid-cache.org/Advisories/SQUID-2018_3.txt
DISCLOSURE TIMELINE
  • 2018-04-16 - Vulnerability reported to vendor
  • 2018-04-19 - Coordinated public release of advisory
  • 2018-04-19 - Advisory Updated
CREDIT Michael Marshall of Trend Micro
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