Information disclosure in libxslt (Alpine package)

1) Information disclosure

EUVDB-ID: #VU18965

Risk: Low

CVSSv4.0: 0.5 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

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

Install update from vendor's website.

Vulnerable software versions

libxslt (Alpine package): 1.1.33-r0 - 1.1.33-r2

CPE2.3

• cpe:2.3:o:alpine:libxslt_alpine_package:1.1.33-r0:*:*:*:*:alpine_linux:*:3.9
• cpe:2.3:o:alpine:libxslt_alpine_package:1.1.33-r1:*:*:*:*:alpine_linux:*:3.9
• cpe:2.3:o:alpine:libxslt_alpine_package:1.1.33-r2:*:*:*:*:alpine_linux:*:3.9

External links

https://git.alpinelinux.org/aports/commit/?id=27b3948601965509fee472f606c59626221f5398
https://git.alpinelinux.org/aports/commit/?id=6e3bb6bd9e635d4d171d323935e6a9721ef4c740
https://git.alpinelinux.org/aports/commit/?id=b98ba48c0925b8f0093983262b8d3fb122ee97dc
https://git.alpinelinux.org/aports/commit/?id=cab2f7460bc61617445a4f921c14b6b9d8ec0e0a

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.