9.8 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.5 High
CVSS2
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:P/I:P/A:P
0.162 Low
EPSS
Percentile
95.9%
Issue Overview:
An issue was discovered in Squid through 4.7. When handling the tag esi:when when ESI is enabled, Squid calls ESIExpression::Evaluate. This function uses a fixed stack buffer to hold the expression while it’s being evaluated. When processing the expression, it could either evaluate the top of the stack, or add a new member to the stack. When adding a new member, there is no check to ensure that the stack won’t overflow.(CVE-2019-12519)
An issue was discovered in Squid through 4.7. 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)
An issue was discovered in Squid 3.3.9 through 3.5.28 and 4.x through 4.7. When Squid is configured to use Digest authentication, it parses the header Proxy-Authorization. It searches for certain tokens such as domain, uri, and qop. Squid checks if this token’s value starts with a quote and ends with one. If so, it performs a memcpy of its length minus 2. Squid never checks whether the value is just a single quote (which would satisfy its requirements), leading to a memcpy of its length minus 1.(CVE-2019-12525)
An issue was discovered in Squid before 5.0.2. A remote attacker can replay a sniffed Digest Authentication nonce to gain access to resources that are otherwise forbidden. This occurs because the attacker can overflow the nonce reference counter (a short integer). Remote code execution may occur if the pooled token credentials are freed (instead of replayed as valid credentials).(CVE-2020-11945)
Affected Packages:
squid
Issue Correction:
Run yum update squid to update your system.
New Packages:
i686:
squid-3.5.20-15.39.amzn1.i686
squid-debuginfo-3.5.20-15.39.amzn1.i686
squid-migration-script-3.5.20-15.39.amzn1.i686
src:
squid-3.5.20-15.39.amzn1.src
x86_64:
squid-migration-script-3.5.20-15.39.amzn1.x86_64
squid-3.5.20-15.39.amzn1.x86_64
squid-debuginfo-3.5.20-15.39.amzn1.x86_64
Red Hat: CVE-2019-12519, CVE-2019-12521, CVE-2019-12525, CVE-2020-11945
Mitre: CVE-2019-12519, CVE-2019-12521, CVE-2019-12525, CVE-2020-11945
OS | Version | Architecture | Package | Version | Filename |
---|---|---|---|---|---|
Amazon Linux | 1 | i686 | squid | < 3.5.20-15.39.amzn1 | squid-3.5.20-15.39.amzn1.i686.rpm |
Amazon Linux | 1 | i686 | squid-debuginfo | < 3.5.20-15.39.amzn1 | squid-debuginfo-3.5.20-15.39.amzn1.i686.rpm |
Amazon Linux | 1 | i686 | squid-migration-script | < 3.5.20-15.39.amzn1 | squid-migration-script-3.5.20-15.39.amzn1.i686.rpm |
Amazon Linux | 1 | x86_64 | squid-migration-script | < 3.5.20-15.39.amzn1 | squid-migration-script-3.5.20-15.39.amzn1.x86_64.rpm |
Amazon Linux | 1 | x86_64 | squid | < 3.5.20-15.39.amzn1 | squid-3.5.20-15.39.amzn1.x86_64.rpm |
Amazon Linux | 1 | x86_64 | squid-debuginfo | < 3.5.20-15.39.amzn1 | squid-debuginfo-3.5.20-15.39.amzn1.x86_64.rpm |
9.8 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.5 High
CVSS2
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:P/I:P/A:P
0.162 Low
EPSS
Percentile
95.9%