Out-of-bounds read in expat (Alpine package)

1) Out-of-bounds read

EUVDB-ID: #VU31844

Risk: Medium

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2009-3560

CWE-ID: CWE-125 - Out-of-bounds read

Exploit availability: No

Description

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

The vulnerability exists due to a boundary condition when processing an XML document with malformed UTF-8 sequences that trigger a buffer over-read, related to the doProlog function in lib/xmlparse.c, a different vulnerability than CVE-2009-2625 and CVE-2009-3720 within the The big2_toUtf8 function in lib/xmltok.c in libexpat in Expat 2.0.1, as used. A remote attacker can create a specially crafted file, pass it to the application, trigger out-of-bounds read error and crash the affected application.

Mitigation

Install update from vendor's website.

Vulnerable software versions

expat (Alpine package): 2.0.1-r0

CPE2.3

• cpe:2.3:a:alpine:expat_alpine_package:2.0.1-r0:*:*:*:*:alpine_linux:*:1.9

External links

https://git.alpinelinux.org/aports/commit/?id=898dee7495223dc8bcc1833067255f8b426a1832
https://git.alpinelinux.org/aports/commit/?id=ebc04c0210d45efc4e5156905cdda9900f4f1ad3
https://git.alpinelinux.org/aports/commit/?id=82105c6f2874a73741115858c9a6d520d13355bd
https://git.alpinelinux.org/aports/commit/?id=8f2b9bbd23a32d826d22d1235b9c9bb88a74ee38
https://git.alpinelinux.org/aports/commit/?id=1b5e6df3780f0db6124afb1b3d114dbfecf7627c

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.