CyberSecBulletin
CVE-2015-3035Exploited in the wildNVD status: Analyzed

TP-Link Multiple Archer Devices Directory Traversal

Published Updated By the CyberSecBulletin desk

CVE-2015-3035 is a high-severity improper limitation of a pathname to a restricted directory vulnerability in Tl-wr741nd Firmware from TP-Link, with a CVSS 3.1 base score of 7.5 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, without any action from a user. The record lists version 150312 as the first without the flaw, so updating Tl-wr741nd Firmware to that release or later removes the exposure. CISA added it to the Known Exploited Vulnerabilities catalogue on March 25, 2022, which means attacks have been observed in the wild.

Patch now

Attackers are already exploiting this vulnerability, according to CISA.

What to do

  1. Update Tl-wr741nd Firmware to 150312 or a later version.
  2. Update Tl-wr841n Firmware to 150310 or a later version.
  3. Update Tl-wr740n Firmware to 150312 or a later version.
  4. CISA's required action: Apply updates per vendor instructions.
  5. Until you can update, restrict network access to the affected service so it is not reachable from untrusted networks.

Affected products and versions

VendorProductAffected versionsFixed in
TP-LinkTl-wr741nd Firmwarebefore 150312150312
TP-LinkTl-wr841n Firmwarebefore 150310150310
TP-LinkTl-wr740n Firmwarebefore 150312150312
TP-LinkArcher C5 Firmwarebefore 150317150317
TP-LinkTl-wdr3600 Firmwarebefore 150302150302
TP-LinkArcher C7 Firmwarebefore 150304150304
TP-LinkTl-wr841nd Firmwarebefore 150310150310
TP-LinkArcher C9 Firmwarebefore 150302150302
TP-LinkArcher C8 Firmwarebefore 150316150316
TP-LinkTl-wdr4300 Firmwarebefore 150302150302
TP-LinkTl-wdr3500 Firmwarebefore 150302150302

Version data comes from NVD's product matching. Confirm against the vendor advisory before deciding you are unaffected.

How the severity score breaks down

Attack vector
NetworkCan be exploited remotely over a network, including the internet.
Attack complexity
LowNo special conditions are needed; the attack works reliably.
Privileges required
NoneNo account or login is needed.
User interaction
NoneNo action by a victim is required.
Scope
UnchangedImpact stays within the vulnerable component.
Confidentiality
HighAll data handled by the component can be read.
Integrity
NoneNothing can be modified.
Availability
NoneAvailability is not affected.

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N. Scored by NVD.

Scoring systemScoreSeverityScored by
CVSS 3.17.5HighNVD
CVSS 3.17.5HighCISA (ADP)
CVSS 2.07.8HighNVD

Official description

Directory traversal vulnerability in TP-LINK Archer C5 (1.2) with firmware before 150317, C7 (2.0) with firmware before 150304, and C8 (1.0) with firmware before 150316, Archer C9 (1.0), TL-WDR3500 (1.0), TL-WDR3600 (1.0), and TL-WDR4300 (1.0) with firmware before 150302, TL-WR740N (5.0) and TL-WR741ND (5.0) with firmware before 150312, and TL-WR841N (9.0), TL-WR841N (10.0), TL-WR841ND (9.0), and TL-WR841ND (10.0) with firmware before 150310 allows remote attackers to read arbitrary files via a .. (dot dot) in the PATH_INFO to login/.

Source: the CVE record as published by its numbering authority, via NVD and CVE.org.

The underlying weakness: Improper Limitation of a Pathname to a Restricted Directory

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.

How developers prevent this class of flaw

  • For 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.
  • Use a vetted library or framework that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid.
  • Use 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.

More Improper Limitation of a Pathname to a Restricted Directory vulnerabilities (CWE-22)

Timeline

  1. CVE record published.
  2. Added to CISA's Known Exploited Vulnerabilities catalogue.
  3. Deadline for US federal agencies to remediate, set by CISA.
  4. CISA published its SSVC assessment (exploitation: active, automatable: yes, technical impact: partial).
  5. Record last changed materially (score, affected products, status or references).

References

Third-party and government advisories

Technical write-ups (may include proof of concept)

Other vulnerabilities in Tl-wr741nd Firmware

All Tl-wr741nd Firmware vulnerabilities

Recent Improper Limitation of a Pathname to a Restricted Directory vulnerabilities

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