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ubuntucveUbuntu.comUB:CVE-2019-12521
HistoryApr 15, 2020 - 12:00 a.m.

CVE-2019-12521

2020-04-1500:00:00
ubuntu.com
ubuntu.com
10

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

5.9 Medium

CVSS3

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

0.034 Low

EPSS

Percentile

91.4%

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.

OSVersionArchitecturePackageVersionFilename
ubuntu19.10noarchsquid< 4.8-1ubuntu2.3UNKNOWN
ubuntu20.04noarchsquid< 4.10-1ubuntu1.1UNKNOWN
ubuntu20.10noarchsquid< 4.10-1ubuntu2UNKNOWN
ubuntu21.04noarchsquid< 4.10-1ubuntu2UNKNOWN
ubuntu18.04noarchsquid3< 3.5.27-1ubuntu1.6UNKNOWN
ubuntu16.04noarchsquid3< 3.5.12-1ubuntu7.11UNKNOWN

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

5.9 Medium

CVSS3

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

0.034 Low

EPSS

Percentile

91.4%