Risk | Medium |
Patch available | YES |
Number of vulnerabilities | 1 |
CVE-ID | CVE-2020-24240 |
CWE-ID | CWE-416 |
Exploitation vector | Network |
Public exploit | N/A |
Vulnerable software Subscribe |
openEuler Operating systems & Components / Operating system bison-help Operating systems & Components / Operating system package or component bison-devel Operating systems & Components / Operating system package or component bison-lang Operating systems & Components / Operating system package or component bison-debugsource Operating systems & Components / Operating system package or component bison-debuginfo Operating systems & Components / Operating system package or component bison Operating systems & Components / Operating system package or component |
Vendor | openEuler |
Security Bulletin
This security bulletin contains one medium risk vulnerability.
EUVDB-ID: #VU46310
Risk: Medium
CVSSv3.1: 5.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]
CVE-ID: CVE-2020-24240
CWE-ID:
CWE-416 - Use After Free
Exploit availability: No
DescriptionThe vulnerability allows a remote non-authenticated attacker to perform a denial of service (DoS) attack.
GNU Bison before 3.7.1 has a use-after-free in _obstack_free in lib/obstack.c (called from gram_lex) when a '�' byte is encountered. NOTE: there is a risk only if Bison is used with untrusted input, and the observed bug happens to cause unsafe behavior with a specific compiler/architecture. The bug report was intended to show that a crash may occur in Bison itself, not that a crash may occur in code that is generated by Bison.
MitigationInstall updates from vendor's repository.
Vulnerable software versionsopenEuler: 20.03 LTS SP1 - 20.03 LTS SP3
bison-help: before 3.6.4-2
bison-devel: before 3.6.4-2
bison-lang: before 3.6.4-2
bison-debugsource: before 3.6.4-2
bison-debuginfo: before 3.6.4-2
bison: before 3.6.4-2
External linkshttp://www.openeuler.org/en/security/security-bulletins/detail/?id=openEuler-SA-2022-1767
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.