Weakness (CWE)
CWE-29: Path Traversal: '\..\filename'
The product uses external input to construct a pathname that should be within a restricted directory, but it does not properly neutralize '\..\filename' (leading backslash dot dot) sequences that can resolve to a location that is outside of that directory.
More detail
Sometimes a program checks for "..\" at the beginning of the input, so a "\..\" can bypass that check. It is also useful for bypassing path traversal protection schemes that only assume that the "/" separator is valid.
How to prevent it (2 mitigations)
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Implementation
Assume 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 of acceptable values, missing or extra inputs, syntax, consistency across related fields, and conformance to business rules. As an example of business rule logic, "boat" may be syntactically valid because it only contains alphanumeric characters, but it is not valid if the input is only expected to contain colors such as "red" or "blue."
Do not rely exclusively on looking for malicious or malformed inputs. This is likely to miss at least one undesirable input, especially if the code's environment changes. This can give attackers enough room to bypass the intended validation. However, denylists can be useful for detecting potential attacks or determining which inputs are so malformed that they should be rejected outright.
When validating filenames, use stringent allowlists that limit the character set to be used. If feasible, only allow a single "." character in the filename to avoid weaknesses such as CWE-23, and exclude directory separators such as "/" to avoid CWE-36. Use a list of allowable file extensions, which will help to avoid CWE-434.
Do not rely exclusively on a filtering mechanism that removes potentially dangerous characters. This is equivalent to a denylist, which may be incomplete (CWE-184). For example, filtering "/" is insufficient protection if the filesystem also supports the use of "\" as a directory separator. Another possible error could occur when the filtering is applied in a way that still produces dangerous data (CWE-182). For example, if "../" sequences are removed from the ".../...//" string in a sequential fashion, two instances of "../" would be removed from the original string, but the remaining characters would still form the "../" string.
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Implementation
Inputs 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.
Source: MITRE CWE-29
11 results · Clear filters · Feed
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High 8.6CVE-2024-21542 Public exploit
luigi Arbitrary File Write via Archive Extraction (Zip Slip)
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Local File Inclusion (LFI) via URI Fragment Parsing in mlflow/mlflow
A Local File Inclusion (LFI) vulnerability was identified in mlflow/mlflow, specifically in version 2.9.2, which was fixed in version 2.11.3. This vulnerability arises from the application's failure to properly validate URI fragments for directory traversal s…
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High 8.4CVE-2024-3435 Public exploit
Path Traversal in parisneo/lollms-webui
A path traversal vulnerability exists in the 'save_settings' endpoint of the parisneo/lollms-webui application, affecting versions up to the latest release before 9.5. The vulnerability arises due to insufficient sanitization of the 'config' parameter in the …
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High 7.5
Path Traversal in parisneo/lollms-webui
A path traversal vulnerability exists in the parisneo/lollms-webui application, specifically within the `/list_personalities` endpoint. By manipulating the `category` parameter, an attacker can traverse the directory structure and list any directory on the sy…
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High 8.6CVE-2024-34470 Public exploit
An issue was discovered in HSC Mailinspector 5.2.17-3 through v.5.2.18. An Unauthenticated Path Traversal vulnerability…
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High 7.5CVE-2024-1561 Public exploit
Arbitrary Local File Read via Component Method Invocation in gradio-app/gradio
An issue was discovered in gradio-app/gradio, where the `/component_server` endpoint improperly allows the invocation of any method on a `Component` class with attacker-controlled arguments. Specifically, by exploiting the `move_resource_to_block_cache()` met…
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Critical 9.9
Directory Traversal in zenml-io/zenml
A directory traversal vulnerability exists in the zenml-io/zenml repository, specifically within the /api/v1/steps endpoint. Attackers can exploit this vulnerability by manipulating the 'logs' URI path in the request to fetch arbitrary file content, bypassing…
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Critical 9.3
Path Traversal: '\..\filename' in mlflow/mlflow
Path Traversal: '\..\filename' in GitHub repository mlflow/mlflow prior to 2.2.1.
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Medium 6.9CVE-2022-25842 Public exploit
Arbitrary File Write via Archive Extraction (Zip Slip)
All versions of package com.alibaba.oneagent:one-java-agent-plugin are vulnerable to Arbitrary File Write via Archive Extraction (Zip Slip) using a specially crafted archive that holds directory traversal filenames (e.g. ../../evil.exe). The attacker can over…
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Medium 5.5CVE-2019-10743 Public exploit
Path Traversal in MHolt Archiver
All versions of archiver allow attacker to perform a Zip Slip attack via the "unarchive" functions. It is exploited using a specially crafted zip archive, that holds path traversal filenames. When exploited, a filename in a malicious archive is concatenated t…