Summary

Binary scan of Brocade Fabric OS identified multiple potential CVEs against glibc

CVE-2020-6096

An exploitable signed comparison vulnerability exists in the ARMv7 memcpy() implementation of GNU glibc 2.30.9000. Calling memcpy() (on ARMv7 targets that utilize the GNU glibc implementation) with a negative value for the 'num' parameter results in a signed comparison vulnerability. If an attacker underflows the 'num' parameter to memcpy(), this vulnerability could lead to undefined behavior such as writing to out-of-bounds memory and potentially remote code execution. Furthermore, this memcpy() implementation allows for program execution to continue in scenarios where a segmentation fault or crash should have occurred. The dangers occur in that subsequent execution and iterations of this code will be executed with this corrupted data.

CVE-2020-10029

The GNU C Library (aka glibc or libc6) before 2.32 could overflow an on-stack buffer during range reduction if an input to an 80-bit long double function contains a non-canonical bit pattern, a seen when passing a 0x5d414141414141410000 value to sinl on x86 targets. This is related to sysdeps/ieee754/ldbl-96/e_rem_pio2l.c.

CVE-2021-27645

The nameserver caching daemon (nscd) in the GNU C Library (aka glibc or libc6) 2.29 through 2.33, when processing a request for netgroup lookup, may crash due to a double-free, potentially resulting in degraded service or Denial of Service on the local system. This is related to netgroupcache.c.

Products Affected

• No Brocade Fibre channel products from Broadcom are affected

Products Not Affected

• Brocade Fabric OS versions before 10.0.0
  [VEX Justification: Vulnerable_code_not_in_execute_path]
• Brocade ASCG
  [VEX Justification: Vulnerable_code_not_in_execute_path]
• Brocade SANnav
  [VEX Justification: Vulnerable_code_not_in_execute_path]

Solution

• While Brocade Fabric OS is not affected, a security update has been provided in Brocade Fabric OS 10.0.0
• While Brocade ASCG is not affected, a security update has been provided in Brocade ASCG 3.0.0

Revision History

Disclaimer

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