openEuler update for libssh

1) Buffer overflow

EUVDB-ID: #VU56217

Risk: High

CVSSv4.0: 7.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2021-3634

CWE-ID: CWE-119 - Memory corruption

Exploit availability: No

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to a boundary error when handling shared secrets. A remote attacker can supply a shared secret of a different size, trigger a memory corruption during the second key re-exchange and crash the application or potentially execute arbitrary code.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Mitigation

Install updates from vendor's repository.

Vulnerable software versions

openEuler: 20.03 LTS SP1 - 20.03 LTS SP2

libssh-help: before 0.9.4-5

libssh-debuginfo: before 0.9.4-5

libssh-debugsource: before 0.9.4-5

libssh-devel: before 0.9.4-5

libssh: before 0.9.4-5

CPE2.3

• cpe:2.3:o:openeuler:openeuler:20.03:LTS SP1:*:*:*:*:*:*
• cpe:2.3:o:openeuler:openeuler:20.03:LTS SP2:*:*:*:*:*:*
• cpe:2.3:a:openeuler:libssh-help:*:*:*:*:*:openeuler:*:*
• cpe:2.3:a:openeuler:libssh-debuginfo:*:*:*:*:*:openeuler:*:*
• cpe:2.3:a:openeuler:libssh-debugsource:*:*:*:*:*:openeuler:*:*
• cpe:2.3:a:openeuler:libssh-devel:*:*:*:*:*:openeuler:*:*
• cpe:2.3:a:openeuler:libssh:*:*:*:*:*:openeuler:*:*

External links

https://www.openeuler.org/en/security/security-bulletins/detail/?id=openEuler-SA-2021-1343

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.