Memory corruption via mismatched HTTP body copy
Published Jan 25, 2021 · Updated Aug 4, 2024
Heap-buffer overflow in AgentUpdater in Rostelecom CS-C2SHW 5.0.082.1 allows attackers to corrupt memory via a crafted HTTP response. The parser allocates pld_buf from Content-Length plus one, then copies body bytes using a length derived from the complete response buffer and body offset, causing an out-of-bounds write. Default configuration fully parses only responses from vendor-set HTTPS URLs, so exploitation requires another flaw or configuration change; code execution is discussed but not demonstrated.
Summary
What happened
Heap-buffer overflow in AgentUpdater in Rostelecom CS-C2SHW 5.0.082.1 allows attackers to corrupt memory via a crafted HTTP response. The parser allocates pld_buf from Content-Length plus one, then copies body bytes using a length derived from the complete response buffer and body offset, causing an out-of-bounds write. Default configuration fully parses only responses from vendor-set HTTPS URLs, so exploitation requires another flaw or configuration change; code execution is discussed but not demonstrated.
The record
- CVE
- CVE-2020-27539
- Published
- Jan 25, 2021
- Updated
- Aug 4, 2024
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-787, T1203
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jan 25, 2021CVE 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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What is affected?
Affected products and versions are unavailable in this record.
Attacks
What attackers are doing with it
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Public exploit references
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Technologies
Your stack
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Your stack
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