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CWE-22 (对路径名的限制不恰当(路径遍历)) — Vulnerability Class 3479

3479 vulnerabilities classified as CWE-22 (对路径名的限制不恰当(路径遍历)). AI Chinese analysis included.

CWE-22 represents a critical input validation weakness where software fails to properly sanitize external input before constructing file paths. Attackers typically exploit this vulnerability by injecting directory traversal sequences, such as “../”, into user-supplied parameters. These malicious inputs allow the application to resolve file references outside the intended restricted directory, potentially granting unauthorized access to sensitive system files, configuration data, or source code. To mitigate this risk, developers must implement rigorous input validation techniques, ensuring that all path components are strictly checked against allowed characters and structures. Additionally, employing canonicalization to resolve symbolic links and relative paths before validation, combined with strict chroot jails or sandboxing, effectively confines file operations to designated directories, thereby neutralizing the potential for path traversal attacks and preserving system integrity.

MITRE CWE Description
The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. Many file operations are intended to take place within a restricted directory. By using special elements such as ".." and "/" separators, attackers can escape outside of the restricted location to access files or directories that are elsewhere on the system. One of the most common special elements is the "../" sequence, which in most modern operating systems is interpreted as the parent directory of the current location. This is referred to as relative path traversal. Path traversal also covers the use of absolute pathnames such as "/usr/local/bin" to access unexpected files. This is referred to as absolute path traversal.
Common Consequences (4)
Integrity, Confidentiality, AvailabilityExecute Unauthorized Code or Commands
The attacker may be able to create or overwrite critical files that are used to execute code, such as programs or libraries.
IntegrityModify Files or Directories
The attacker may be able to overwrite or create critical files, such as programs, libraries, or important data. If the targeted file is used for a security mechanism, then the attacker may be able to bypass that mechanism. For example, appending a new account at the end of a password file may allow …
ConfidentialityRead Files or Directories
The attacker may be able read the contents of unexpected files and expose sensitive data. If the targeted file is used for a security mechanism, then the attacker may be able to bypass that mechanism. For example, by reading a password file, the attacker could conduct brute force password guessing a…
AvailabilityDoS: Crash, Exit, or Restart
The attacker may be able to overwrite, delete, or corrupt unexpected critical files such as programs, libraries, or important data. This may prevent the product from working at all and in the case of protection mechanisms such as authentication, it has the potential to lock out product users.
Mitigations (5)
ImplementationAssume all input is malicious. Use an "accept known good" input validation strategy, i.e., use a list of acceptable inputs that strictly conform to specifications. Reject any input that does not strictly conform to specifications, or transform it into something that does. When performing input validation, consider all potentially relevant properties, including length, type of input, the full range…
Architecture and DesignFor any security checks that are performed on the client side, ensure that these checks are duplicated on the server side, in order to avoid CWE-602. Attackers can bypass the client-side checks by modifying values after the checks have been performed, or by changing the client to remove the client-side checks entirely. Then, these modified values would be submitted to the server.
ImplementationInputs should be decoded and canonicalized to the application's current internal representation before being validated (CWE-180). Make sure that the application does not decode the same input twice (CWE-174). Such errors could be used to bypass allowlist validation schemes by introducing dangerous inputs after they have been checked. Use a built-in path canonicalization function (such as realpath(…
Architecture and DesignUse a vetted library or framework that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid [REF-1482].
OperationUse an application firewall that can detect attacks against this weakness. It can be beneficial in cases in which the code cannot be fixed (because it is controlled by a third party), as an emergency prevention measure while more comprehensive software assurance measures are applied, or to provide defense in depth [REF-1481].
Effectiveness: Moderate
Examples (2)
The following code could be for a social networking application in which each user's profile information is stored in a separate file. All files are stored in a single directory.
my $dataPath = "/users/cwe/profiles"; my $username = param("user"); my $profilePath = $dataPath . "/" . $username; open(my $fh, "<", $profilePath) || ExitError("profile read error: $profilePath"); print "<ul>\n"; while (<$fh>) { print "<li>$_</li>\n"; } print "</ul>\n";
Bad · Perl
../../../etc/passwd
Attack
In the example below, the path to a dictionary file is read from a system property and used to initialize a File object.
String filename = System.getProperty("com.domain.application.dictionaryFile"); File dictionaryFile = new File(filename);
Bad · Java
CVE IDTitleCVSSSeverityPublished
CVE-2020-14366 Red Hat Keycloak 路径遍历漏洞 — keycloak 6.8 Medium2020-11-09
CVE-2020-3588 Cisco Webex Meetings Desktop App Arbitrary Code Execution Vulnerability — Cisco Webex Meetings Desktop App 7.3 High2020-11-06
CVE-2020-27128 Cisco SD-WAN vManage Software Arbitrary File Creation Vulnerability — Cisco SD-WAN vManage 6.5 Medium2020-11-06
CVE-2020-15703 aptdaemon allows unprivileged users to test for the presence of local files via the transaction Locale property — aptdaemon 4.0 Medium2020-10-31
CVE-2020-3550 Cisco Firepower Management Center Software and Firepower Threat Defense Software Directory Traversal Vulnerability — Cisco Firepower Management Center 8.1 -2020-10-21
CVE-2020-15229 Path traversal and files overwrite with unsquashfs — singularity 8.2 High2020-10-14
CVE-2020-15239 Directory Traversal in xmpp-http-upload — xmpp-http-upload 3.5 Low2020-10-06
CVE-2020-15236 Directory Traversal in Wiki.js — wiki 8.6 High2020-10-05
CVE-2020-15230 Arbitrary file read un Vapor — vapor 8.5 High2020-10-02
CVE-2020-3130 Cisco Unity Connection Directory Traversal Vulnerability — Cisco Unity Connection 6.5 -2020-09-23
CVE-2020-3143 Cisco TelePresence Collaboration Endpoint, TelePresence Codec, and RoomOS Software Path Traversal Vulnerability — Cisco TelePresence TC Software 7.2 -2020-09-23
CVE-2020-15182 Cross-site Request Forgery leading to RCE in SOY CMS — soycms 8.4 High2020-09-17
CVE-2020-7529 SCADAPack Remote Connect 路径遍历漏洞 — SCADAPack 7x Remote Connect V3.6.3.574 and prior. 6.2 -2020-09-16
CVE-2020-7268 McAfee Email Gateway (MEG) - Path Traversal vulnerability — McAfee Email Gateway (MEG) 4.3 Medium2020-09-16
CVE-2020-3365 Cisco Enterprise NFV Infrastructure Software Path Traversal Vulnerability — Cisco Enterprise NFV Infrastructure Software 4.3 Medium2020-09-04
CVE-2020-6142 OS4Ed openSIS 路径遍历漏洞 — OS4Ed 9.8 -2020-09-01
CVE-2020-7522 Schneider Electric APC Easy UPS On-Line Software 路径遍历漏洞 — SFAPV9601 - APC Easy UPS On-Line Software V2.0 and earlier 9.8 -2020-08-31
CVE-2020-7521 Schneider Electric APC Easy UPS On-Line Software 路径遍历漏洞 — SFAPV9601 - APC Easy UPS On-Line Software V2.0 and earlier 9.8 -2020-08-31
CVE-2020-14352 Librepo 路径遍历漏洞 — librepo 6.8 -2020-08-30
CVE-2020-3440 Cisco Webex Meetings Desktop App for Windows Arbitrary File Overwrite Vulnerability — Cisco Webex Meetings 8.1 -2020-08-26
CVE-2020-3490 Cisco Vision Dynamic Signage Director Path Traversal Vulnerability — Cisco Vision Dynamic Signage Director 4.9 Medium2020-08-26
CVE-2020-17389 Marvell QConvergeConsole 路径遍历漏洞 — QConvergeConsole 8.8 -2020-08-25
CVE-2020-17387 Marvell QConvergeConsole 路径遍历漏洞 — QConvergeConsole 8.8 -2020-08-25
CVE-2020-15644 Marvell QConvergeConsole 路径遍历漏洞 — QConvergeConsole 8.8 -2020-08-25
CVE-2020-15641 Marvell QConvergeConsole 路径遍历漏洞 — QConvergeConsole 7.5 -2020-08-25
CVE-2020-15643 Marvell QConvergeConsole 路径遍历漏洞 — QConvergeConsole 8.8 -2020-08-25
CVE-2020-15639 Marvell QConvergeConsole 路径遍历漏洞 — QConvergeConsole 9.8 -2020-08-25
CVE-2020-15640 Marvell QConvergeConsole 路径遍历漏洞 — QConvergeConsole 7.5 -2020-08-25
CVE-2020-16245 Advantech iView 路径遍历漏洞 — Advantech iView 9.8 -2020-08-25
CVE-2020-8227 Nextcloud 路径遍历漏洞 — Desktop Client 6.5 -2020-08-21

Vulnerabilities classified as CWE-22 (对路径名的限制不恰当(路径遍历)) represent 3479 CVEs. The CWE taxonomy describes the weakness; review individual CVEs for product-specific impact.