Slackware Linux update for zsh

Published: 2019-01-14 09:37:11 | Updated: 2019-01-14
Severity Low
Patch available YES
Number of vulnerabilities 7
CVE ID CVE-2017-18205
CVE-2017-18206
CVE-2018-1071
CVE-2018-1083
CVE-2018-1100
CVE-2018-7548
CVE-2018-7549
CVSSv3 3.5 [CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C]
3.5 [CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C]
2.9 [CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C]
7.7 [CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C]
7.7 [CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C]
2.9 [CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C]
3.5 [CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C]
CWE ID CWE-476
CWE-120
CWE-121
CWE-20
Exploitation vector Local
Public exploit N/A
Vulnerable software Slackware Linux
Vulnerable software versions Slackware Linux 14.2
Slackware Linux 14.1
Slackware Linux 14.0
Vendor URL Slackware

Security Advisory

1) NULL pointer dereference

Description

The vulnerability allows a local unauthenticated attacker to cause DoS condition on the target system.

The weakness exists due to a NULL pointer dereference when processing a cd command while in sh compatibility mode. A local attacker can cause the service to crash.

Remediation

Update the affected package zsh.

External links

http://www.slackware.com/security/viewer.php?l=slackware-security&y=2019&m=slackware-security.407621

2) Buffer overflow

Description

The vulnerability allows a local attacker to cause DoS condition on the target system.

The weakness exists in the utils.c source code file due to insufficient checks on buffer lengths for symlink expansion. A local attacker can send specially crafted input, trigger memory corruption and cause the service to crash.

Remediation

Update the affected package zsh.

External links

http://www.slackware.com/security/viewer.php?l=slackware-security&y=2019&m=slackware-security.407621

3) Stack-based buffer overflow

Description

The vulnerability allows a local attacker to cause DOS condition on the target system.

The weakness exists in the exec.c:hashcmd() function due to stack-based buffer overflow. A local attacker can trigger memory corruption and cause the service to crash.

Remediation

Update the affected package zsh.

External links

http://www.slackware.com/security/viewer.php?l=slackware-security&y=2019&m=slackware-security.407621

4) Buffer overflow

Description

The vulnerability allows a local attacker to gain elevated privileges on the target system.

The weakness exists in the compctl.c source code file due to insufficient bounds checking on the PATH_MAX-sized buffer used for file completion candidates. A local attacker can create a malicious directory path, trick the victim into using the autocomplete functionality to traverse the path, trigger buffer overflow and execute arbitrary code with root privileges.

Successful exploitation of the vulnerability may result in system compromise.

Remediation

Update the affected package zsh.

External links

http://www.slackware.com/security/viewer.php?l=slackware-security&y=2019&m=slackware-security.407621

5) Stack-based buffer overflow

Description

The vulnerability allows a local attacker to gain elevated privileges on the target system.

The vulnerability exists due to stack-based buffer overflow in the utils.c:checkmailpath function. A local attacker can trigger memory corruption and execute arbitrary code with elevated privileges.

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

Remediation

Update the affected package zsh.

External links

http://www.slackware.com/security/viewer.php?l=slackware-security&y=2019&m=slackware-security.407621

6) NULL pointer dereference

Description

The vulnerability allows a local attacker to cause DoS condition on the target system.

The weakness exists in the subst.c source code file due to a NULL pointer dereference. A local attacker can implement ${(PA)...} characters on an empty array result, trigger a NULL pointer dereference condition and cause the service to crash.

Remediation

Update the affected package zsh.

External links

http://www.slackware.com/security/viewer.php?l=slackware-security&y=2019&m=slackware-security.407621

7) Improper input validation

Description

The vulnerability allows a local attacker to cause DoS condition on the target system.

The weakness exists in the params.c source code file due to improper handling of hash tables. A local attacker can copy an empty hash table with the typeset -p command and cause the service to crash.

Remediation

Update the affected package zsh.

External links

http://www.slackware.com/security/viewer.php?l=slackware-security&y=2019&m=slackware-security.407621

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