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CURL-CVE-2017-8818
No affected components available
libcurl contains an out boundary access flaw in SSL related code.
When allocating memory for a connection (the internal struct called
connectdata), a certain amount of memory is allocated at the end of the
struct to be used for SSL related structs. Those structs are used by the
particular SSL library libcurl is built to use. The application can also tell
libcurl which specific SSL library to use if it was built to support more than
one.
The math used to calculate the extra memory amount necessary for the SSL library was wrong on 32-bit systems, which made the allocated memory too small by 4 bytes. The last struct member of the last object within the memory area could then be outside of what was allocated. Accessing that member could lead to a crash or other undefined behaviors depending on what memory that is present there and how the particular SSL library decides to act on that memory content.
Specifically the vulnerability is present if libcurl was built so that
sizeof(long long *) < sizeof(long long) which as far as we are aware only
happens in 32-bit builds.
Measures severity based on intrinsic characteristics of the vulnerability, independent of environment.
No exploitation activity has been observed at this time. Continue routine monitoring.
The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
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