Ubuntu update for Libxslt

Published: 2019-10-23

Risk	High
Patch available	YES
Number of vulnerabilities	3
CVE-ID	CVE-2019-18197 CVE-2019-13118 CVE-2019-13117
CWE-ID	CWE-119 CWE-200
Exploitation vector	Network
Public exploit	N/A
Vulnerable software Subscribe	libxslt (Ubuntu package) Operating systems & Components / Operating system package or component
Vendor	Canonical Ltd.

Security Bulletin

This security bulletin contains information about 3 vulnerabilities.

1) Buffer overflow

EUVDB-ID: #VU21942

Risk: High

CVSSv3.1: 8.1 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:U/RC:C]

CVE-ID: CVE-2019-18197

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 within the xsltCopyText() function in transform.c in libxslt. A remote attacker can create a specially crafted XML document, pass it to the affected application, trigger memory corruption 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 packages.

Ubuntu 19.10: libxslt1.1 - 1.1.33-0ubuntu1.1
Ubuntu 19.04: libxslt1.1 - 1.1.32-2ubuntu0.2
Ubuntu 18.04 LTS: libxslt1.1 - 1.1.29-5ubuntu0.2
Ubuntu 16.04 LTS: libxslt1.1 - 1.1.28-2.1ubuntu0.3
Ubuntu 14.04 ESM: libxslt1.1 - 1.1.28-2ubuntu0.2+esm1
Ubuntu 12.04 ESM: libxslt1.1 - 1.1.26-8ubuntu1.6

Vulnerable software versions

libxslt (Ubuntu package): 1.1.28-2.1ubuntu0.1 - 1.1.32-2ubuntu0.1

External links

http://usn.ubuntu.com/4164-1/

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) Information disclosure

EUVDB-ID: #VU18966

Risk: Low

CVSSv3.1: 4 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N/E:U/RL:U/RC:C]

CVE-ID: CVE-2019-13118

CWE-ID: CWE-200 - Information exposure

Exploit availability: No

Description

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

The vulnerability exists due to uninitialized stack data exposure in numbers.c in libxslt library when processing an invalid character/length combination in xsltNumberFormatDecimal. A remote attacker can gain pass specially crafted data to the application using the affected library and gain access to sensitive information.

Mitigation

Update the affected packages.

Ubuntu 19.10: libxslt1.1 - 1.1.33-0ubuntu1.1
Ubuntu 19.04: libxslt1.1 - 1.1.32-2ubuntu0.2
Ubuntu 18.04 LTS: libxslt1.1 - 1.1.29-5ubuntu0.2
Ubuntu 16.04 LTS: libxslt1.1 - 1.1.28-2.1ubuntu0.3
Ubuntu 14.04 ESM: libxslt1.1 - 1.1.28-2ubuntu0.2+esm1
Ubuntu 12.04 ESM: libxslt1.1 - 1.1.26-8ubuntu1.6

Vulnerable software versions

libxslt (Ubuntu package): 1.1.28-2.1ubuntu0.1 - 1.1.32-2ubuntu0.1

External links

http://usn.ubuntu.com/4164-1/

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.

3) Information disclosure

EUVDB-ID: #VU18965

Risk: Low

CVSSv3.1: 2.9 [CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N/E:U/RL:U/RC:C]

CVE-ID: CVE-2019-13117

CWE-ID: CWE-200 - Information exposure

Exploit availability: No

Description

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

The vulnerability exists due to information disclosure in numbers.c in libxslt library where an xsl:number with certain format strings could lead to a uninitialized read in xsltNumberFormatInsertNumbers. A remote attacker can gain knowledge whether a byte on the stack contains the characters A, a, I, i, or 0, or any other character.

Mitigation

Update the affected packages.

Ubuntu 19.10: libxslt1.1 - 1.1.33-0ubuntu1.1
Ubuntu 19.04: libxslt1.1 - 1.1.32-2ubuntu0.2
Ubuntu 18.04 LTS: libxslt1.1 - 1.1.29-5ubuntu0.2
Ubuntu 16.04 LTS: libxslt1.1 - 1.1.28-2.1ubuntu0.3
Ubuntu 14.04 ESM: libxslt1.1 - 1.1.28-2ubuntu0.2+esm1
Ubuntu 12.04 ESM: libxslt1.1 - 1.1.26-8ubuntu1.6

Vulnerable software versions

libxslt (Ubuntu package): 1.1.28-2.1ubuntu0.1 - 1.1.32-2ubuntu0.1

External links

http://usn.ubuntu.com/4164-1/

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.