When unserializing an object with dynamic properties HHVM needs to pre-reserve the full size of the dynamic property array before inserting

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

• facebook hhvmbefore 4.32.3
• facebook hhvm4.33.0 and later · before 4.56.1
• facebook hhvm4.57.0
• facebook hhvm4.58.0
• facebook hhvm4.58.1
• facebook hhvm4.59.0
• facebook hhvm4.60.0
• facebook hhvm4.61.0
• facebook hhvm4.62.0

Versions reported by the vendor

Affected version ranges reported by the assigning authority (facebook). Independent of NVD's CPE analysis and usually ahead of it.

• Facebook HHVM

  • 4.62.0, 4.61.0, 4.60.0, 4.59.0, 4.57.0affected
  • 4.62.1 and later · before unspecifiednot affected
  • 4.61.1 and later · before unspecifiednot affected
  • 4.60.1 and later · before unspecifiednot affected
  • 4.59.1 and later · before unspecifiednot affected
  • 4.58.2 and later · before unspecifiednot affected
  • 4.58.0 and later · before unspecifiedaffected
  • 4.57.1 and later · before unspecifiednot affected
  • 4.56.1 and later · before unspecifiednot affected
  • 4.33.0 and later · before unspecifiedaffected

Other highest-scoring records for the same primary product.

• CVE-2019-11930An invalid free in mb_detect_order can cause the application to crash or potentially result in remote code execution.
  40Plan
• CVE-2019-11929Insufficient boundary checks when formatting numbers in number_format allows read/write access to out-of-bounds memory, potentially leading
  40Plan
• CVE-2019-11926Insufficient boundary checks when processing M_SOFx markers from JPEG headers in the GD extension could allow access to out-of-bounds memory
  40Plan
• CVE-2019-11925Insufficient boundary checks when processing the JPEG APP12 block marker in the GD extension could allow access to out-of-bounds memory via
  40Plan
• CVE-2019-3561Insufficient boundary checks for the strrpos and strripos functions allow access to out-of-bounds memory.
  40Plan
• CVE-2019-3557The implementations of streams for bz2 and php://output improperly implemented their readImpl functions, returning -1 consistently.
  40Plan

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Root cause

After a memory region is freed, another reference pointing to it is still used. By then, the same region may have been allocated for different data.

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

1free(dev->buf);2/* ... another thread is still running ... */3process(dev->buf);

1lock(&dev->lock);2free(dev->buf);3dev->buf = NULL;4unlock(&dev->lock);

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.