4.3 Medium
CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
AV:N/AC:M/Au:N/C:N/I:N/A:P
9.3 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
HIGH
Integrity Impact
LOW
Availability Impact
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:N
7.4 High
AI Score
Confidence
Low
0.034 Low
EPSS
Percentile
91.4%
Issue Overview:
A flaw was found in squid. When Squid is parsing ESI, it keeps the ESI elements in ESIContext. ESIContext contains a buffer for holding a stack of ESIElements. When a new ESIElement is parsed, it is added via addStackElement. addStackElement has a check for the number of elements in this buffer, but it’s off by 1, leading to a Heap Overflow of 1 element. The overflow is within the same structure so it can’t affect adjacent memory blocks, and thus just leads to a crash while processing. (CVE-2019-12521)
Due to chunked decoder lenience Squid is vulnerable to Request/Response smuggling attacks when parsing HTTP/1.1 and ICAP messages. (CVE-2023-46846)
Affected Packages:
squid
Note:
This advisory is applicable to Amazon Linux 2 (AL2) Core repository. Visit this FAQ section for the difference between AL2 Core and AL2 Extras advisories.
Issue Correction:
Run yum update squid to update your system.
New Packages:
aarch64:
squid-3.5.20-17.amzn2.7.20.aarch64
squid-sysvinit-3.5.20-17.amzn2.7.20.aarch64
squid-migration-script-3.5.20-17.amzn2.7.20.aarch64
squid-debuginfo-3.5.20-17.amzn2.7.20.aarch64
i686:
squid-3.5.20-17.amzn2.7.20.i686
squid-sysvinit-3.5.20-17.amzn2.7.20.i686
squid-migration-script-3.5.20-17.amzn2.7.20.i686
squid-debuginfo-3.5.20-17.amzn2.7.20.i686
src:
squid-3.5.20-17.amzn2.7.20.src
x86_64:
squid-3.5.20-17.amzn2.7.20.x86_64
squid-sysvinit-3.5.20-17.amzn2.7.20.x86_64
squid-migration-script-3.5.20-17.amzn2.7.20.x86_64
squid-debuginfo-3.5.20-17.amzn2.7.20.x86_64
Red Hat: CVE-2019-12521, CVE-2023-46846
Mitre: CVE-2019-12521, CVE-2023-46846
4.3 Medium
CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
AV:N/AC:M/Au:N/C:N/I:N/A:P
9.3 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
HIGH
Integrity Impact
LOW
Availability Impact
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:N
7.4 High
AI Score
Confidence
Low
0.034 Low
EPSS
Percentile
91.4%