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libcurl 7.49.0 to and including 7.57.0 contains an out bounds read in code handling HTTP/2 trailers. It was reported (https://github.com/curl/curl/pull/2231) that reading an HTTP/2 trailer could mess up future trailers since the stored size was one byte less than required. The problem is that the code that creates HTTP/1-like headers from the HTTP/2 trailer data once appended a string like `:` to the target buffer, while this was recently changed to `: ` (a space was added after the colon) but the following math wasn't updated correspondingly. When accessed, the data is read out of bounds and causes either a crash or that the (too large) data gets passed to client write. This could lead to a denial-of-service situation or an information disclosure if someone has a service that echoes back or uses the trailers for something.
Publish Date : 2018-01-24 Last Update Date : 2019-06-18
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CVSS Scores & Vulnerability Types
| CVSS Score |
6.4 |
| Confidentiality Impact |
Partial
(There is considerable informational disclosure.) |
| Integrity Impact |
None
(There is no impact to the integrity of the system) |
| Availability Impact |
Partial
(There is reduced performance or interruptions in resource availability.) |
| Access Complexity |
Low
(Specialized access conditions or extenuating circumstances do not exist. Very little knowledge or skill is required to exploit. ) |
| Authentication |
Not required
(Authentication is not required to exploit the vulnerability.) |
| Gained Access |
None |
| Vulnerability Type(s) |
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| CWE ID |
125 |
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Products Affected By CVE-2018-1000005
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Number Of Affected Versions By Product
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References For CVE-2018-1000005
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Metasploit Modules Related To CVE-2018-1000005
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