The git_oid_nfmt function in commit.c in libgit2 before 0.24.3 allows remote attackers to cause a denial of service (NULL pointer dereference) via a cat-file command with a crafted object file.
Weakness
The product dereferences a pointer that it expects to be valid but is NULL.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Libgit2 | Libgit2_project | * | 0.24.2 (including) |
| Libgit2 | Ubuntu | artful | * |
| Libgit2 | Ubuntu | esm-apps/xenial | * |
| Libgit2 | Ubuntu | esm-infra-legacy/trusty | * |
| Libgit2 | Ubuntu | trusty | * |
| Libgit2 | Ubuntu | trusty/esm | * |
| Libgit2 | Ubuntu | upstream | * |
| Libgit2 | Ubuntu | xenial | * |
| Libgit2 | Ubuntu | yakkety | * |
| Libgit2 | Ubuntu | zesty | * |
Potential Mitigations
References
- http://lists.opensuse.org/opensuse-updates/2016-12/msg00075.html
- http://lists.opensuse.org/opensuse-updates/2017-01/msg00103.html
- http://lists.opensuse.org/opensuse-updates/2017-01/msg00110.html
- http://lists.opensuse.org/opensuse-updates/2017-01/msg00114.html
- http://www.openwall.com/lists/oss-security/2016/10/08/7
- http://www.securityfocus.com/bid/93465
- https://bugzilla.redhat.com/show_bug.cgi?id=1383211
- https://github.com/libgit2/libgit2/issues/3937
- https://github.com/libgit2/libgit2/releases/tag/v0.24.3
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4E77DG5KGQ7L34U75QY7O6NIPKZNQHQJ/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/X3JBSNJAXP7JA3TGE2NPNRTD77JXFG4E/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XVUEIG6EESZB6BRU2IE3F5NRUEHMAEKC/
- http://lists.opensuse.org/opensuse-updates/2016-12/msg00075.html
- http://lists.opensuse.org/opensuse-updates/2017-01/msg00103.html
- http://lists.opensuse.org/opensuse-updates/2017-01/msg00110.html
- http://lists.opensuse.org/opensuse-updates/2017-01/msg00114.html
- http://www.openwall.com/lists/oss-security/2016/10/08/7
- http://www.securityfocus.com/bid/93465
- https://bugzilla.redhat.com/show_bug.cgi?id=1383211
- https://github.com/libgit2/libgit2/issues/3937
- https://github.com/libgit2/libgit2/releases/tag/v0.24.3
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4E77DG5KGQ7L34U75QY7O6NIPKZNQHQJ/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/X3JBSNJAXP7JA3TGE2NPNRTD77JXFG4E/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XVUEIG6EESZB6BRU2IE3F5NRUEHMAEKC/