Debian update for libssh2

Published: 2019-04-15 11:11:01 | Updated: 2019-04-15
Severity Medium
Patch available YES
Number of vulnerabilities 9
CVE ID CVE-2019-3855
CVE-2019-3856
CVE-2019-3857
CVE-2019-3858
CVE-2019-3859
CVE-2019-3860
CVE-2019-3861
CVE-2019-3862
CVE-2019-3863
CVSSv3 6.5 [CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]
6.5 [CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]
6.5 [CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]
5.2 [CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:H/E:U/RL:O/RC:C]
5.2 [CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:H/E:U/RL:O/RC:C]
5.2 [CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:H/E:U/RL:O/RC:C]
3.7 [CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:L/E:U/RL:O/RC:C]
5.7 [CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]
6.5 [CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]
CWE ID CWE-190
CWE-125
CWE-787
Exploitation vector Network
Public exploit N/A
Vulnerable software libssh2 (Debian package)
Vulnerable software versions libssh2 (Debian package) 1.7.0-1
Vendor URL Debian

Security Advisory

1) Integer overflow

Description

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

The vulnerability exists due to integer overflow in the _libssh2_transport_read() function in transport.cwhen processing packet_lengthvalues. A remote attacker can trick the victim to connect to a malicious SSH server, trigger integer overflow and execute arbitrary code on the target system.

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

Remediation

Update the affected package to version: 1.7.0-1+deb9u1.

External links

https://www.debian.org/security/2019/dsa-4431

2) Integer overflow

Description

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

The vulnerability exists due to integer overflow when parsing keyboard prompt requests. A remote attacker can trick the victim to connect to a malicious SSH server, trigger integer overflow and execute arbitrary code on the target system.

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

Remediation

Update the affected package to version: 1.7.0-1+deb9u1.

External links

https://www.debian.org/security/2019/dsa-4431

3) Integer overflow

Description

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

The vulnerability exists due to integer overflow when parsing SSH_MSG_CHANNEL_REQUEST packets. A remote attacker can trick the victim to connect to a malicious SSH server, trigger integer overflow and execute arbitrary code on the target system.

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

Remediation

Update the affected package to version: 1.7.0-1+deb9u1.

External links

https://www.debian.org/security/2019/dsa-4431

4) Out-of-bounds read

Description

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

The vulnerability exists due to a boundary condition when processing SFTP packets. 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.

Remediation

Update the affected package to version: 1.7.0-1+deb9u1.

External links

https://www.debian.org/security/2019/dsa-4431

5) Out-of-bounds read

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.

Remediation

Update the affected package to version: 1.7.0-1+deb9u1.

External links

https://www.debian.org/security/2019/dsa-4431

6) Out-of-bounds read

Description

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

The vulnerability exists due to a boundary condition when processing SFTP packets. 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.

Remediation

Update the affected package to version: 1.7.0-1+deb9u1.

External links

https://www.debian.org/security/2019/dsa-4431

7) Out-of-bounds read

Description

The vulnerability allows a remote attacker to gain access to potentially sensitive information or perform denial of service (DoS) attack.

The vulnerability exists due to a boundary condition when SSH packets with a padding length value greater than the packet length are parsed. A remote attacker can trick the victim to connect to a malicious SSH server, trigger out of bounds read and gain access to sensitive information or perform denial of service attack.

Remediation

Update the affected package to version: 1.7.0-1+deb9u1.

External links

https://www.debian.org/security/2019/dsa-4431

8) Out-of-bounds read

Description

The vulnerability allows a remote attacker to gain access to potentially sensitive information or perform denial of service (DoS) attack.

The vulnerability exists due to a boundary condition when SSH_MSG_CHANNEL_REQUEST packets with an exit status message and no payload are parsed. A remote attacker can trick the victim to connect to a malicious SSH server, trigger out of bounds read and gain access to sensitive information or perform denial of service attack.

Remediation

Update the affected package to version: 1.7.0-1+deb9u1.

External links

https://www.debian.org/security/2019/dsa-4431

9) Out-of-bounds write

Description

The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to a boundary error when processing total length of multiple keyboard interactive response messages that exceeds the value of unsigned char max characters. A remote attacker can trick the victim to connect to a malicious SSH server, trigger our of bounds write and execute arbitrary code on the system with privileges of the user, running the affected application.

Remediation

Update the affected package to version: 1.7.0-1+deb9u1.

External links

https://www.debian.org/security/2019/dsa-4431

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