Out-of-bounds write in mingw-w64-binutils (Alpine package)

1) Out-of-bounds write

EUVDB-ID: #VU50123

Risk: High

CVSSv3.1: 7.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-35448

CWE-ID: CWE-787 - Out-of-bounds write

Exploit availability: No

Description

The vulnerability allows a remote non-authenticated attacker to execute arbitrary code.

An issue was discovered in the Binary File Descriptor (BFD) library (aka libbfd), as distributed in GNU Binutils 2.35.1. A heap-based buffer over-read can occur in bfd_getl_signed_32 in libbfd.c because sh_entsize is not validated in _bfd_elf_slurp_secondary_reloc_section in elf.c.

Mitigation

Install update from vendor's website.

Vulnerable software versions

mingw-w64-binutils (Alpine package): 2.35.1-r0

External links

http://git.alpinelinux.org/aports/commit/?id=991e7d11fd550cf8cb5899f8aab6a6cd6f206a54

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.