Ubuntu update for ncurses

1) Stack-based buffer overflow

EUVDB-ID: #VU12202

Risk: High

CVSSv3.1: 8.3 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2017-16879

CWE-ID: CWE-121 - Stack-based buffer overflow

Exploit availability: No

Description

The vulnerability allows a remote attacker to cause DoS condition or execute arbitrary code on the target system.

The weakness exists in the _nc_write_entry function in tinfo/write_entry.c due to stac-based buffer overflow. A remote attacker can submit a specially crafted terminfo file, as demonstrated by tic, trick the victim into opening it, trigger memory corruption and cause the service to crash or execute arbitrary code.

Successful exploitation of the vulnerability may result in system compromise.

Mitigation

Update the affected package ncurses to the latest version.

Vulnerable software versions

Ubuntu: 14.04 - 16.04

libncurses5 (Ubuntu package): before 6.0+201602131ubuntu1+esm2

ncurses-bin (Ubuntu package): before 6.0+201602131ubuntu1+esm2

libtinfo5 (Ubuntu package): before 6.0+201602131ubuntu1+esm2

External links

http://ubuntu.com/security/notices/USN-5477-1

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.

2) Null pointer dereference

EUVDB-ID: #VU15935

Risk: Low

CVSSv3.1: 5.9 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C]

CVE-ID: CVE-2018-19211

CWE-ID: CWE-476 - NULL Pointer Dereference

Exploit availability: No

Description

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

The vulnerability exists due to NULL pointer dereference condition in the _nc_write_entry function when handling maliciou input. A remote attacker can trick the victim into opening a specially crafted file that submits malicious input, trigger a NULL pointer dereference condition and cause the service to crash.

Mitigation

Update the affected package ncurses to the latest version.

Vulnerable software versions

Ubuntu: 14.04 - 16.04

libncurses5 (Ubuntu package): before 6.0+201602131ubuntu1+esm2

ncurses-bin (Ubuntu package): before 6.0+201602131ubuntu1+esm2

libtinfo5 (Ubuntu package): before 6.0+201602131ubuntu1+esm2

External links

http://ubuntu.com/security/notices/USN-5477-1

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. However, proof of concept for this vulnerability is available.

3) Heap-based buffer overflow

EUVDB-ID: #VU21792

Risk: High

CVSSv3.1: 7.3 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C]

CVE-ID: CVE-2019-17594

CWE-ID: CWE-122 - Heap-based Buffer Overflow

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 in the "_nc_find_entry" function in "tinfo/comp_hash.c" in the terminfo library. A remote attacker can trigger heap-based buffer overflow and execute arbitrary code on the target system.

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

Mitigation

Update the affected package ncurses to the latest version.

Vulnerable software versions

Ubuntu: 14.04 - 16.04

libncurses5 (Ubuntu package): before 6.0+201602131ubuntu1+esm2

ncurses-bin (Ubuntu package): before 6.0+201602131ubuntu1+esm2

libtinfo5 (Ubuntu package): before 6.0+201602131ubuntu1+esm2

External links

http://ubuntu.com/security/notices/USN-5477-1

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. However, proof of concept for this vulnerability is available.

4) Buffer Over-read

EUVDB-ID: #VU21793

Risk: Medium

CVSSv3.1: 4.8 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:P/RL:O/RC:C]

CVE-ID: CVE-2019-17595

CWE-ID: CWE-126 - Buffer over-read

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to heap-based buffer over-read issue in the "fmt_entry" function in "tinfo/comp_hash.c" in the terminfo library. A remote attacker can trigger a buffer over-read condition and cause a denial of service condition on the target system.

Mitigation

Update the affected package ncurses to the latest version.

Vulnerable software versions

Ubuntu: 14.04 - 16.04

libncurses5 (Ubuntu package): before 6.0+201602131ubuntu1+esm2

ncurses-bin (Ubuntu package): before 6.0+201602131ubuntu1+esm2

libtinfo5 (Ubuntu package): before 6.0+201602131ubuntu1+esm2

External links

http://ubuntu.com/security/notices/USN-5477-1

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. However, proof of concept for this vulnerability is available.

5) Out-of-bounds write

EUVDB-ID: #VU57577

Risk: High

CVSSv3.1: 7.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-39537

CWE-ID: CWE-787 - Out-of-bounds write

Exploit availability: No

Description

The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to a boundary error when processing untrusted input. A remote attacker can create a specially crafted file, trick the victim into opening it using the affected software, trigger out-of-bounds write and execute arbitrary code on the target system.

Mitigation

Update the affected package ncurses to the latest version.

Vulnerable software versions

Ubuntu: 14.04 - 16.04

libncurses5 (Ubuntu package): before 6.0+201602131ubuntu1+esm2

ncurses-bin (Ubuntu package): before 6.0+201602131ubuntu1+esm2

libtinfo5 (Ubuntu package): before 6.0+201602131ubuntu1+esm2

External links

http://ubuntu.com/security/notices/USN-5477-1

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.

6) Out-of-bounds read

EUVDB-ID: #VU64274

Risk: Medium

CVSSv3.1: 4.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2022-29458

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 in convert_strings in tinfo/read_entry.c in the terminfo library. A remote attacker can create a specially crafted file, trick the victim into opening it, trigger out-of-bounds read error and read contents of memory on the system.

Mitigation

Update the affected package ncurses to the latest version.

Vulnerable software versions

Ubuntu: 14.04 - 16.04

libncurses5 (Ubuntu package): before 6.0+201602131ubuntu1+esm2

ncurses-bin (Ubuntu package): before 6.0+201602131ubuntu1+esm2

libtinfo5 (Ubuntu package): before 6.0+201602131ubuntu1+esm2

External links

http://ubuntu.com/security/notices/USN-5477-1

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.