Configuration overwrite via unchecked PJL file path
Published Jan 20, 2022 · Updated Aug 4, 2024
Path traversal in the PJL processor of affected Lexmark printer firmware allows remote attackers to overwrite internal configuration files. The proprietary LDLWELCOMESCREEN handler passes its FILE argument directly to open() without restricting traversal outside an intended directory. No authentication is required in the default configuration; writes are limited to nonexistent paths with existing writable parent directories and enable root code execution when chained with a process crash.
Summary
What happened
Path traversal in the PJL processor of affected Lexmark printer firmware allows remote attackers to overwrite internal configuration files. The proprietary LDLWELCOMESCREEN handler passes its FILE argument directly to open() without restricting traversal outside an intended directory. No authentication is required in the default configuration; writes are limited to nonexistent paths with existing writable parent directories and enable root code execution when chained with a process crash.
The record
- CVE
- CVE-2021-44737
- Published
- Jan 20, 2022
- Updated
- Aug 4, 2024
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-22, CAPEC-126, T1190
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Nov 1, 2021Exploitation reportedPwn2Own 2021 successful exploitation
- Jan 20, 2022CVE publishedPublication date reported by the CVE source.
- Aug 4, 2024Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
What conditions does exploitation require?
What is affected?
Affected products and versions are unavailable in this record.
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- MissionAbrt exploit demonstrationfunctional · demonstrated
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Reported exploitation
- Pwn2Own 2021 successful exploitationreported exploitation
Technologies
Your stack
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Your stack
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