Out-of-bounds read in libgit2 - CVE-2018-8098

Vulnerability identifier: #VU11154

CSH Severity: Low

CVSS v4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]

CVE-ID: CVE-2018-8098

CWE-ID: CWE-125

Exploitation vector: Remote access

Exploit availability: No public exploit available

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

The weakness exists in the index.c:read_entry() function due to out-of-bounds read while decompressing a compressed prefix length. A remote attacker can send a specially crafted repository index file, trick the victim into opening it and cause the service to crash.

libgit2
Fedora
Ubuntu
libgit2 (Ubuntu package)
libgit2
python-pygit2

Update to version 0.26.2.

libgit2 (Ubuntu package) - addressed in versions 0.19.0-2ubuntu0.4+esm2, 0.24.1-2ubuntu0.2+esm3, 0.26.0+dfsg.1-1.1ubuntu0.2+esm2, 0.28.4+dfsg.1-2ubuntu0.1+esm1, 1.1.0+dfsg.1-4.1ubuntu0.1+esm1, 1.7.2+ds-1ubuntu3.1, 1.9.1+ds-1ubuntu1.1
libgit2 - addressed in versions 0.26.3-1.el7, 0.26.3-1.fc27, 0.26.3-1.fc28
python-pygit2 - update to 0.26.4-1.el7

• https://libgit2.github.com/security/

• Denial of service in libgit2
• Fedora 28 update for libgit2
• Fedora 27 update for libgit2
• Fedora EPEL 7 update for libgit2, python-pygit2
• Ubuntu update for libgit2