Vulnerability Details : CVE-2018-6337
folly::secureRandom will re-use a buffer between parent and child processes when fork() is called. That will result in multiple forked children producing repeat (or similar) results. This affects HHVM 3.26 prior to 3.26.3 and the folly library between v2017.12.11.00 and v2018.08.09.00.
Vulnerability category: Overflow
Products affected by CVE-2018-6337
Exploit prediction scoring system (EPSS) score for CVE-2018-6337
0.19%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 56 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2018-6337
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
5.0
|
MEDIUM | AV:N/AC:L/Au:N/C:N/I:P/A:N |
10.0
|
2.9
|
NIST | |
|
7.5
|
HIGH | CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N |
3.9
|
3.6
|
NIST |
CWE ids for CVE-2018-6337
-
The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.Assigned by: nvd@nist.gov (Primary)
-
The product stores, transfers, or shares a resource that contains sensitive information, but it does not properly remove that information before the product makes the resource available to unauthorized actors.Assigned by: cve-assign@fb.com (Secondary)
References for CVE-2018-6337
-
https://hhvm.com/blog/2018/05/24/hhvm-3.26.3.html
HHVM 3.26.3 | HHVMRelease Notes;Vendor Advisory
-
https://github.com/facebook/hhvm/commit/e2d10a1e32d01f71aaadd81169bcb9ae86c5d6b8
[security][CVE-2018-6337] Flush folly::secureRandom buffer on fork · facebook/hhvm@e2d10a1 · GitHubPatch;Third Party Advisory
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https://github.com/facebook/folly/commit/8e927ee48b114c8a2f90d0cbd5ac753795a6761f
Flush secureRandom buffer on fork · facebook/folly@8e927ee · GitHubPatch;Third Party Advisory
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