Buffer Overflow Vulnerability in Squid Web Proxy
CVE-2019-12519

9.8CRITICAL

Key Information:

Vendor

Squid-cache

Status
Squid
Vendor
CVE Published:
15 April 2020

What is CVE-2019-12519?

A buffer overflow vulnerability exists in the Squid web proxy, specifically within the handling of esi:when expressions when ESI is enabled. The vulnerability emerges during the evaluation process in the ESIExpression::Evaluate function, which utilizes a fixed stack buffer. Without proper checks to ensure the stack does not overflow when adding new members, an attacker could exploit this flaw to compromise the service, potentially leading to unauthorized access or service disruption.

References

https://gitlab.com/jeriko.one/security/-/blob/master/squi...
x_refsource_MISC
http://www.openwall.com/lists/oss-security/2020/04/23/1
mailing-listx_refsource_MLIST
https://www.debian.org/security/2020/dsa-4682
vendor-advisoryx_refsource_DEBIAN

EPSS Score

7% chance of being exploited in the next 30 days.

CVSS V3.1

Score:
9.8
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.