Vulnerability Report

CVE-2021-21707

Title: XML parsing functions URL-decode filename

Arbitrary File Read

Proof Of Concept

No public PoC currently indexed for CVE-2021-21707.

CWE Category CWE-159
Published Date Nov 29, 2021
Modified Date Nov 21, 2024
Exploit Status Not Found
Score 5.3 CVSS v3.1
Exploit Probability (EPSS)
0.56%

Vulnerability Summary

CVE-2021-21707: In PHP versions 7.3.x below 7.3.33, 7.4.x below 7.4.26 and 8.0.x below 8.0.13, certain XML parsing functions, like simplexml_load_file(), URL-decode the filename passed to them. If that filename contains URL-encoded NUL character, this may cause the function to interpret this as the end of the filename, thus interpreting the filename differently from what the user intended, which may lead it to reading a different file than intended.

Impacted Vendors

P
php_group 1
N
netapp 1
T
tenable 1
P
php 1

Reference Links

https://bugs.php.net/bug.php?id=79971 https://lists.debian.org/debian-lts-announce/2022/12/msg00030.html https://security.netapp.com/advisory/ntap-20211223-0005/ https://www.debian.org/security/2022/dsa-5082 https://www.tenable.com/security/tns-2022-09 https://bugs.php.net/bug.php?id=79971 https://lists.debian.org/debian-lts-announce/2022/12/msg00030.html https://security.netapp.com/advisory/ntap-20211223-0005/ https://www.debian.org/security/2022/dsa-5082 https://www.tenable.com/security/tns-2022-09
CVSS v3.1
Source Entity [email protected]
Severity MEDIUM
5.3
Attack Vector
NETWORK
Complexity
LOW
Privileges
N/A
Interaction
NONE
Confidentiality
N/A
Integrity
N/A
Availability
N/A
Scope
UNCHANGED
RAW VECTOR CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
CVSS v3.1
Source Entity [email protected]
Severity MEDIUM
5.3
Attack Vector
NETWORK
Complexity
LOW
Privileges
N/A
Interaction
NONE
Confidentiality
N/A
Integrity
N/A
Availability
N/A
Scope
UNCHANGED
RAW VECTOR CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
CVSS v2.0
Source Entity [email protected]
Severity MEDIUM
5.0
Access Vector
N/A
Authentication
N/A
RAW VECTOR AV:N/AC:L/Au:N/C:P/I:N/A:N

Associated Attack Patterns (CAPEC)

Total: Patterns

CVE-2021-21707 Exploits & PoCs (Proof Of Concept)

No public PoCs found in our database for this CVE.

MODIFIED

Vulnerability data or affected products updated.

PUBLISHED

Vulnerability first announced in NVD.

Attack Vector Matrix

Access Vector NETWORK
Complexity LOW
Privileges N/A
Interaction NONE
CVSS Vector String CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Affected Stack

No specific products linked.