PT-2020-5786 · Squid+8 · Squid+9
Jeriko One
·
Published
2020-04-15
·
Updated
2024-06-15
·
CVE-2019-12519
CVSS v3.1
9.8
Critical
| Vector | AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
Name of the Vulnerable Software and Affected Versions:
Squid versions through 4.7
Description:
The issue is related to the ESIExpression::Evaluate function in the Squid proxy server, which is associated with a buffer data boundary overflow. This could allow a remote attacker to access confidential data, compromise its integrity, and cause a denial of service. The problem arises when handling the
esi:when tag with ESI enabled, as the ESIExpression::Evaluate function uses a fixed stack buffer without checking for potential overflows when adding new members to the stack.Recommendations:
For Squid versions through 4.7, consider disabling the ESI feature to prevent exploitation until a patch is available.
As a temporary workaround, restrict access to the
ESIExpression::Evaluate function to minimize the risk of exploitation.
Avoid using the esi:when tag in configurations where ESI is enabled until the issue is resolved.Fix
Memory Corruption
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Weakness Enumeration
Related Identifiers
Affected Products
Alt Linux
Almalinux
Centos
Linuxmint
Red Hat
Rocky Linux
Squid
Squid Cache
Suse
Ubuntu