Out-of-bounds read in libssh2 (Alpine package)

1) Out-of-bounds read

EUVDB-ID: #VU18027

Risk: Medium

CVSSv4.0: 1.7 [CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:A/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2019-3859

CWE-ID: CWE-125 - Out-of-bounds read

Exploit availability: No

Description

The vulnerability allows a remote attacker to gain access to potentially sensitive information.

The vulnerability exists due to a boundary condition when processing packets in _libssh2_packet_require() and _libssh2_packet_requirev() functions. A remote attacker can trick the victim to connect to a malicious SSH server, trigger out-of-bounds read error and read contents of memory or crash the affected application.

Mitigation

Install update from vendor's website.

Vulnerable software versions

IBM Tivoli Storage Manager: 7.1.4.1

libssh2 (Alpine package): 2.11-1

libssh2 (Alpine package): 2.0.3 - 2.0.4

libssh2 (Alpine package): 1.20130913-1

libssh2 (Alpine package): 2.9

libssh2 (Alpine package): 0.5.8-0ubuntu1

libssh2 (Alpine package): 2.0.28

libssh2 (Alpine package): 1.5.27ubuntu2 - 1.5.28

libssh2 (Alpine package): 2.2.1-4 - 2.2.1-46-g10887d272-2

libssh2 (Alpine package): 5 - 9

libssh2 (Alpine package): 8.20-3ubuntu2 - 8.21-1ubuntu2

libssh2 (Alpine package): 10.0

libssh2 (Alpine package): 9.0.2.881

libssh2 (Alpine package): 7.0.3

libssh2 (Alpine package): 2007

libssh2 (Alpine package):

libssh2 (Alpine package): All versions

CPE2.3

• cpe:2.3:a:ibm_corporation:ibm_tivoli_storage_manager:7.1.4.1:*:*:*:*:*:*:*
• cpe:2.3:a:alpine:libssh2_alpine_package:2.11-1:*:*:*:*:alpine_linux:*:*
• cpe:2.3:a:alpine:libssh2_alpine_package:2.0.3:*:*:*:*:alpine_linux:*:*
• cpe:2.3:a:alpine:libssh2_alpine_package:2.0.4:*:*:*:*:alpine_linux:*:*
• cpe:2.3:a:alpine:libssh2_alpine_package:1.20130913-1:*:*:*:*:alpine_linux:*:*
• cpe:2.3:a:alpine:libssh2_alpine_package:2.9:*:*:*:*:alpine_linux:*:*
• cpe:2.3:a:alpine:libssh2_alpine_package:0.5.8-0ubuntu1:*:*:*:*:alpine_linux:*:*
• cpe:2.3:a:alpine:libssh2_alpine_package:2.0.28:*:*:*:*:alpine_linux:*:*
• cpe:2.3:a:alpine:libssh2_alpine_package:1.5.27ubuntu2:*:*:*:*:alpine_linux:*:*
• cpe:2.3:a:alpine:libssh2_alpine_package:1.5.28:*:*:*:*:alpine_linux:*:*
• cpe:2.3:a:alpine:libssh2_alpine_package:2.2.1-4:*:*:*:*:alpine_linux:*:*
• cpe:2.3:a:alpine:libssh2_alpine_package:5:*:*:*:*:alpine_linux:*:*
• cpe:2.3:a:alpine:libssh2_alpine_package:8.20-3ubuntu2:*:*:*:*:alpine_linux:*:*
• cpe:2.3:a:alpine:libssh2_alpine_package:10.0:*:*:*:*:alpine_linux:*:*
• cpe:2.3:a:alpine:libssh2_alpine_package:9.0.2.881:*:*:*:*:alpine_linux:*:*
• cpe:2.3:a:alpine:libssh2_alpine_package:7.0.3:*:*:*:*:alpine_linux:*:*
• cpe:2.3:a:alpine:libssh2_alpine_package:2007:*:*:*:*:alpine_linux:*:*
• cpe:2.3:a:alpine:libssh2_alpine_package::*:*:*:*:alpine_linux:*:*
• cpe:2.3:a:alpine:libssh2_alpine_package:*:*:*:*:*:alpine_linux:*:3.6

External links

https://git.alpinelinux.org/aports/commit/?id=d60ef1f3b3cd3b40d41722b7de616227c0b83a2b
https://git.alpinelinux.org/aports/commit/?id=eec223036af35046c74baca7b09d6a81aaccbe86
https://git.alpinelinux.org/aports/commit/?id=0c38351d5beace23bc498ea5fc79b3ba6a012b6e
https://git.alpinelinux.org/aports/commit/?id=27f813a2ece1924d1c8f2e02239ad214611599fb
https://git.alpinelinux.org/aports/commit/?id=4f69ccce51fcfa18af42948e79d26c5d0ba42733

Q & A

Can this vulnerability be exploited remotely?

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

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

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